New LS1 Owners - Newbie Tech - Why do i get terrible gas mileage?

Even when I'm PURPOSELY not flooring it and coming out of lights like a grandma, I get terrible gas mileage. Even after a a full tune-up, I thought i would get much better gas mileage. I've only had one tank full of gas since the tune-up, but it's pretty much the worse total mileage already. I'm talking like 150 miles and I'm past the half way point on the gauge... What am I doing wrong or what can I do to help this? Thoughts, insights?

I only wish I could get 150 miles out of a half tank! Realistically I'm getting between 180 and 200 a tank. I think your doing all right. What did you get before?

No, I'm well PAST the half tank point with only 150. I'd say half way between 1/2 and 1/4 left. Most I've gotten out of a full tank is about 250. Normally I get 215-235. But I see threads on here where people are talking about getting 23-24 mpg?!?! That's like over 300 miles.... I'm like, what's the deal here.

Even when I'm PURPOSELY not flooring it and coming out of lights like a grandma, I get terrible gas mileage. Even after a a full tune-up, I thought i would get much better gas mileage. I've only had one tank full of gas since the tune-up, but it's pretty much the worse total mileage already. I'm talking like 150 miles and I'm past the half way point on the gauge... What am I doing wrong or what can I do to help this? Thoughts, insights?

Full tune-up, what did that involve? Also, 6 speed or auto? What gears, what tires? What kind of car? Car tuned, mods? :angel:

P.S. any o2 sensor codes?

I get like 13mpg hybrid city/highway and 23 straight highway

Man im lucky to get 100 miles to the halfway mark. I dont get it either.... change your plugs/wires, air filter, fuel filter, clean your throttle body, and if none of that helps try new o2 sensors and a tune

That doesn't seem bad when you're talking about city driving. I doubt I get near that but then again I like to mash the loud pedal a lot. I mean gas only costs half what it did a few months ago right... :)

i get 200-240 with 10 gallons (i always fill up when im around a 1/4 tank) but i dont drive like a maniac.

Full tune-up, what did that involve? Also, 6 speed or auto? What gears, what tires? What kind of car? Car tuned, mods? :angel:

P.S. any o2 sensor codes?

Full Tune-up == Plugs, Wires, Air filter, Fuel filter, Oil and filter changed

Car is totally stock... gears (3.42 for WS6?), no tune or anything changed from factory settings.

Falken tires on stock WS6 17" wheels

The SES light went on a few months ago and it through a TPS and O2 sensor code. Changed the TPS first and the light went off. I just figured the O2 code was "old". Maybe I should check the O2 sensors?

Full Tune-up == Plugs, Wires, Air filter, Fuel filter, Oil and filter changed

Car is totally stock... gears (3.42 for WS6?), no tune or anything changed from factory settings.

Falken tires on stock WS6 17" wheels

The SES light went on a few months ago and it through a TPS and O2 sensor code. Changed the TPS first and the light went off. I just figured the O2 code was "old". Maybe I should check the O2 sensors?

3.42 if it's an M6

how many miles? maby it should be seafoamed? and fuel filter's changed out then see whats what....

No, I'm well PAST the half tank point with only 150. I'd say half way between 1/2 and 1/4 left. Most I've gotten out of a full tank is about 250. Normally I get 215-235. But I see threads on here where people are talking about getting 23-24 mpg?!?! That's like over 300 miles.... I'm like, what's the deal here.

First of all you need to check it the right way. Fill it up and reset the trip odometer. Next time you get fuel fill it up and write the mileage down. Divide mileage by gallons for MPG. Do this a few times to get an average.

My A4 Z28 has been getting around 240 to 270 miles between fill ups. Last was 263 miles so it got 17 MPG, and thats no highway at all. All the "whats your gas mileage" threads are probably absolute best seen.
If I posted my best it would be my M6 SS on a highway trip, it got 27 mpg. Non highway it gets around 14 to 18 mpg.

dito if you wanted good gas milage your deffently in the wrong type of car... Some things that might be hurting it worse though are somethings you may have done to it. For example do you have gears upgraded? I think stock gears are 2.73's but if your running 3.73's or 4.10's its going to make it worse and those people talking about 24 mpg could be driving 6 speeds and know how to use them if your in an auto thats bad. no ofense though ls1's shouldnt be the car of someone who is worried about gas

dito if you wanted good gas milage your deffently in the wrong type of car... Some things that might be hurting it worse though are somethings you may have done to it. For example do you have gears upgraded? I think stock gears are 2.73's but if your running 3.73's or 4.10's its going to make it worse and those people talking about 24 mpg could be driving 6 speeds and know how to use them if your in an auto thats bad. no ofense though ls1's shouldnt be the car of someone who is worried about gas

LS1s are actually pretty good on gas, not great but very good considering how much power you can have and still have very decent mileage. I've gotten 27 highway going WOT at least a few times and running the AC and there's more than a few that claim 30+ but do a search and you will see that.

Gear ratios: GU2 = 2.73, GU5 = 3.23 and GU6 = 3.42

http://wiki.ls1tech.com/forums/showthread.php?t=412366

Yeah, it's an M6 with 3.42 and as I mentioned earlier, the fuel filter WAS changed.

Car has 110,xxx miles on it and I seafoamed it completely right before the tune-up. I know it's not going to get great gas mileage given the V8 plus quite a bit of stock hp right out of the factory, I just thought there could be something that is keeping mpg low.

I figure when I get the intake/exhaust sides modded, perhaps a tune or 2 will get things running a little bit more soundly...

Full Tune-up == Plugs, Wires, Air filter, Fuel filter, Oil and filter changed

Car is totally stock... gears (3.42 for WS6?), no tune or anything changed from factory settings.

Falken tires on stock WS6 17" wheels

The SES light went on a few months ago and it through a TPS and O2 sensor code. Changed the TPS first and the light went off. I just figured the O2 code was "old". Maybe I should check the O2 sensors?

Interesting, like someone else said, make sure you are calculating your MPG correctly. You might try clearing your MAF (there is a cleaner for this), a dirty MAF could cause some odd reading and eat up some fuel. Also check your tire pressure and make sure they are all good. Also for city driving, I don't see you getting over 20, so don't confuse that for when folks say they get 20+

I get probably 18ish in the city and have to fill up at about 235ish miles. But for all highway i can usually go to about 330 or so depending on how fast i was going.

Isn't it just as accurate to reset the Tripometer (which I do everytime I fill up) and take the total number of miles divided by the 15.5, the number of gallons the tanks holds? As I mentioned in an earlier post, I normally seem between 220 and 235/245 (250 at the most I ever got on a full tank), so according to my calculations that...

220/15.5 = 14.19 mpg
235/15.5 = 15.16 mpg
245/15.5 = 15.81 mpg
250/15.5 = 16.13 mpg

Seems pretty low to me, especially babying the throttle and not mashing the accelerator pedal everytime I come out of a stop light. I just wanted to know everyone else's averages to see if I was leaving something on the table. This tank, the one immediately AFTER the full tune-up, which one would believe I would get the BEST mpg out of the tank, is actually looking like it'll be the worst.

Oh, and the fuel filter IS NOT leaking. I've checked several times at idle and after a drive.

No, because unless you are actually putting 15.5 gallons in it, then you are calculating more gallons than used. I dont think you can actually use 15.5 gallons, if you do, then you would be rolling into the station on fumes.

To the OP i have only checked my MPG while on highway trips, so I cant tell you if what is wrong if anything. I average 220-240 miles on the first half of a tank on the highway. I usually average around 26-27mpg highway. I would guess around 20 in town, but I havn't ever checked it.

Isn't it just as accurate to reset the Tripometer (which I do everytime I fill up) and take the total number of miles divided by the 15.5, the number of gallons the tanks holds? As I mentioned in an earlier post, I normally seem between 220 and 235/245 (250 at the most I ever got on a full tank), so according to my calculations that...

220/15.5 = 14.19 mpg
235/15.5 = 15.16 mpg
245/15.5 = 15.81 mpg
250/15.5 = 16.13 mpg

Seems pretty low to me, especially babying the throttle and not mashing the accelerator pedal everytime I come out of a stop light. I just wanted to know everyone else's averages to see if I was leaving something on the table. This tank, the one immediately AFTER the full tune-up, which one would believe I would get the BEST mpg out of the tank, is actually looking like it'll be the worst.

No...look at how many gallons you're putting in, divide it by that number...

When does the Check Gages light come on the dash? When does the Fuel light come on? I guess that would be my answer, because when I'm trying to figure this stuff out, I normally try to run the tank down as low as possible. So I guess you are right, 99345hp, I need to use a gallon or 2 less than 15.5.

I'm gonna do this 2 or 3 times and I'll get back on and post some more accurate numbers.

I know in my dads 2000 gmc 2500 when the low gas light came on it still had like 5 gallons left in it.

Fill the tank up till it clicks, reset trip meter, drive it till there is about a quarter left, then fill it up till the click. check the amount of gas you put in the car.

Take the miles driven since your first fillup and divide it by the gallons on the pump.

Alright, will do.

Hey hey!:D Go Steelers! :D - I couldn't help it.

02 sensors can have a serious effect on gas mileage. I'd swap both upstream units as they help determine fuel mixture.

When does the Check Gages light come on the dash? When does the Fuel light come on? I guess that would be my answer, because when I'm trying to figure this stuff out, I normally try to run the tank down as low as possible. So I guess you are right, 99345hp, I need to use a gallon or 2 less than 15.5.

I'm gonna do this 2 or 3 times and I'll get back on and post some more accurate numbers.

You need to fill the tank up all the way (until the gas nozzle stops itself), reset your trip mileage, and then drive.
Then next time you fill up, fill the gas tank all the way like before, and see how many gallons the you put in the tank according to the pump. Then take THAT number and divide by your current miles.
Also put it in 6th gear as soon as possible.
Last time I checked my gas mileage I was averaging 21mpg mixed city (30mph or lower with traffic) and highway (50mph+), and a good amount of romping over the weekend. If I drove it normal Im sure I would average at least 25mpg.

You need to fill the tank up all the way (until the gas nozzle stops itself), reset your trip mileage, and then drive.
Then next time you fill up, fill the gas tank all the way like before, and see how many gallons the you put in the tank according to the pump. Then take THAT number and divide by your current miles.
Also put it in 6th gear as soon as possible.
Last time I checked my gas mileage I was averaging 21mpg mixed city (30mph or lower with traffic) and highway (50mph+), and a good amount of romping over the weekend. If I drove it normal Im sure I would average at least 25mpg.

If you are in 6th gear as soon as possible, doesn't this sometimes bog down or lug the engine and actual cost MORE fuel to be consumed. Simply put, isn't it sometimes better to drive at a higher rpm (i.e. 2,000) in say 4th or 5th gear as opposed to a low rpm (i.e. 1,000) in 6th gear?

If you are in 6th gear as soon as possible, doesn't this sometimes bog down or lug the engine and actual cost MORE fuel to be consumed. Simply put, isn't it sometimes better to drive at a higher rpm (i.e. 2,000) in say 4th or 5th gear as opposed to a low rpm (i.e. 1,000) in 6th gear?

I thought the same thing. I took several 2000 mile trips last year and got around 24 mpg. Last trip I took, I drove in 6th and just tried to not accelerate hard and to not downshift and pass someone. I got 27 mpg driving like this on the last two trips. And I have 3.73's.

One other thing about calculating fuel used. It doesn't matter if you run from full to 3/4 and fill up. as long as you take the actual gallons you used (put back in) and miles driven to do the calc it still should come out correct.

My highway mileage is amazing, 80mph and I can still hit 26mpg, do 70mph and I can hit 29mpg.

My city on the other hand blows goats. I use up more than DOUBLE the fuel, ie somewhere around 13mpg in city. A few quick blips on the highway and I can toss that up to a combined 18-20mpg.

You also have to take into account your driving in another way in city. How often do you sit idling? How often do you accelerate, ie from stops or from x speed to y speed? Keep in mind the energy used to accelerate a mass from x speed to y speed is enormous compared to the energy used to overcome wind resistance + tire friction of the roads, this is why highway is so fuel efficient. Cut mass of the car or increase aerodynamics, and the mileage goes up on highway far more than the city mileage.

The more time you spend accelerating opposed to holding the same speed will dictate how much fuel you will use when driving. So city driving for one person may be completely different from the next guy who drives in the city but rarely stops or blips throttle.

If you are in 6th gear as soon as possible, doesn't this sometimes bog down or lug the engine and actual cost MORE fuel to be consumed. Simply put, isn't it sometimes better to drive at a higher rpm (i.e. 2,000) in say 4th or 5th gear as opposed to a low rpm (i.e. 1,000) in 6th gear?

As long as your engine is not really bogging (and you can feel it).
Driving at 1000RPMs will yield better gas mileage opposed to higher RPMs. For reference I usually switch to 6th at around 50mph. If you are cruising at a set speed for a while put it in the highest gear possible to be around 1000RPMs.
This isn't some gutless 4 cylinder, we make gobs of torque down low, use it.

Shit.. I get 170-200 miles per tank in my 402. I have gotten as much as 360 miles in 1 tank driving to vegas and back at 80 MPH when I had just bolt on's in my 346 ci.

I thought that we had bigger tanks than the 15.5 gallon mark?? I'm pretty sure it's closer to 16.5 or so.

250 was about average for me mix of city/highway before H/C, stall, gears. wouldnt call that horrible at all. i have a similar route now that ive got all that stuff and its about 190-200 miles a tank filling up with an eighth or so left in there,

get another daily driver, it helped me out a ton during the summer

thats weird . i got a 00 SS. i used to get hella shitty gas mileage and then realized it was because i was gunnin it from start to finish lol i jus recently filled up and reset my trip meter. i took it easily and the tank lasted me a week and i went 220 miles and still had half a quarter tank

Ehh, no matter what the tank size is, I seem to be on par with alot of geared autos. roughly 17-19 mpg combined city/highway.

I thought that we had bigger tanks than the 15.5 gallon mark?? I'm pretty sure it's closer to 16.5 or so.

Around 16.9 I think, my VCM says max capacity is 16.8 gallons. The gauges read empty long before you've used up all of the fuel though, I've never put in 16 gallons even though the gauge was reading below E for a good while.

My gauge is horribly inaccurate. Close to half will actually be gone just after aroung 1/8 below the first quarter mark, 3/4-1/4 represents 1/3 of a tank, the last 1/4 will read as a quarter until you are down to your last 2 gallons then it plummets to red line E as you waste out the last bit of fuel.

I thought that we had bigger tanks than the 15.5 gallon mark?? I'm pretty sure it's closer to 16.5 or so.

Manual says 15.5 gallon capacity... why would it be wrong?

Manual says 15.5 gallon capacity... why would it be wrong?

To keep you from running out of gas? :D

Manual says 15.5 gallon capacity... why would it be wrong?

I just checked my owner's manual for a 2001 like you appear to have and it says 16.5 US gallons.

Tank size changed after 98.

i get 200-250 a tank with my 190k lt1...

Well, all in all, it looks like I'm right on par with the rest a' yuz!

I'm still gonna keep a record and post it to this thread for kicks... :)

I'm getting just over 23mpg around town! stop & go traffic, but it doesn't seem to change much cruising at around 80mph, 23.49 was last I got & my gauge shows multiple miss fires on all cylinders while driving! 95octane, they sell 99 at the pump, cost aside, would I see a difference in milage?

I'm getting just over 23mpg around town! stop & go traffic, but it doesn't seem to change much cruising at around 80mph, 23.49 was last I got & my gauge shows multiple miss fires on all cylinders while driving! 95octane, they sell 99 at the pump, cost aside, would I see a difference in milage?

Dang, 23 around town? Seems incredibly high... good work.

it sounds like your getting ok to me if your at 150 at half tank your getting 19 mph but if your between half and a quarter so about 16-17 mpg thats still not that bad thats about what i get when i drive i think one time i did get city and i know for a fact i got 31 hwy with my 2.73s and my a4. your tank if 15.5 gal

Actually, I JUST looked at the manual ("2001 Firebird") and it sure does say 16.5 gal... I guess I shouldn't go off my bad memory :)

No...look at how many gallons you're putting in, divide it by that number...

I think he understands that. I usually put in 12.5, 13 max. I end up with around 12 mpg. Stalled auto's aren't known to have good gas mileage. My buddies 402 LS2 6 speed gets waaay better mileage than mine.

I think he understands that. I usually put in 12.5, 13 max. I end up with around 12 mpg. Stalled auto's aren't known to have good gas mileage. My buddies 402 LS2 6 speed gets waaay better mileage than mine.

I love how these gauges can read below E for several miles and when I go to put in gas I can only get 14 something gallons in it....so there's still about two gallons left in the tank! I guess that cuts down on stranded Fbodys that have run out of gas :D

Did anyone ever determine at what amount of fuel the check gages light comes on? Fuel light?

asdfasdfasdfsadfasdfsadfsadfsdafsadfasdfsadfsadfsa dfsadfsadfsadfsadfsadfsadfsadfsadfsdafsdfsdafsdaf

wtf is this crap?

wtf is this crap?
He's an idiot troll spamming to 50+ posts so he can sell = banned! :judge:

~ Craig

thanks for cleanin up the thread.

No...look at how many gallons you're putting in, divide it by that number...

Yeah definately! if your not using this method you are cutting yourself short. Just look at what the pump says your putting in and use that number. Personally I say nothing is really wrong I think your about average with your set up.

YOu dont get bad milage, i'm happy if i get 150 miles from a full tank! I get terrible gas milage, i get like 130 miles to a full tank i mean i fill it up when is almost at empty, is mostly city driving though!

YOu dont get bad milage, i'm happy if i get 150 miles from a full tank! I get terrible gas milage, i get like 130 miles to a full tank i mean i fill it up when is almost at empty, is mostly city driving though!

dang you get some crappy mileage. I got that bad once, then checked my air filter, and it was beyond dirty. cleaned it up, put it back in, instantly noticed more power, and then started getting 230+ city.

The last 5-6 fillups ive been getting about 220-240 miles to the tank (~16.5MPG's) mostly city... but im untuned with headers. Idk how some of u guys get 20+ MPG all city...

Ok, filled up the other day... 13.622 gallons on the pump.
Tripometer read 228...

228/13.622 = 16.7 mpg

This was on city/highway(although I hesitate saying highway as the speed limit is 50mph). Nonetheless, it's what I would call "normal" daily driving around the city. Still nowehere CLOSE to 20mpg... :(

I always thought my mileage was bad around town! seems to drain fuel quicker than it did, maybe down to mods & not being tuned.
But my my g/f drives this car a lot & she says it's because women are lighter footed than guys.

LS1s are actually pretty good on gas, not great but very good considering how much power you can have and still have very decent mileage. I've gotten 27 highway going WOT at least a few times and running the AC and there's more than a few that claim 30+ but do a search and you will see that.

Gear ratios: GU2 = 2.73, GU5 = 3.23 and GU6 = 3.42

http://wiki.ls1tech.com/forums/showthread.php?t=412366

sorry I was out of town so I didnt see this. I don't need to do a search thanks. Really all I was saying is your gas mileage is all how you have your ride set up that he may have to demod to get it to go up. Sorry who ever said they got 30mpg but I've never seen it happen. and no way in heck mine gets even close to that maybe 18 - 20 highway and 15 city but I'm not worried about it though. Thats why I have 2 cars.

I've had two f-bodies both autos a 2.73 and a 3.23 the Firehawk with 3.23 gets a good 4to 6 less mpg on the open road. I was really surprised at the difference. It's like the motor has a sweet spot where it makes good power, torque and mileage and if your not cruising in that range your mileage drops.

150 around half tank sounds pretty good to me

**UPDATE**

Just filled up again since i last posted my results...

243.0 miles on the trip.
Filled her up 13.641 gallons...

243.0/13.641 = 17.8 mpg

Looks like I picked up a WHOLE MPG!!

niiiiiiice...

Do you ever drive any highway? that still seems low? I use Fuelly.com to track mileage and right now I am sitting at 22mpg avg (and that includes a lot of playing around, passing people constantly, a few triple digit runs, etc)...

BTW not sure whats up with your tank but I've been on the E for a while (20+ miles with the check guages lit) and the most I put in the car is 13 gallons... my normal fill up on or near the E mark is 12.xx gallons.

**UPDATE**

Just filled up again since i last posted my results...

243.0 miles on the trip.
Filled her up 13.641 gallons...

243.0/13.641 = 17.8 mpg

Looks like I picked up a WHOLE MPG!!

niiiiiiice...

This still sounds a little low. I tried to find what you had done, but no luck. Id also check the 02's if you didnt change those. ESPECIALLY after a seafoam... if you have a real time scanner or know someone w/ one you can see if they are lazy. Also, tire pressure and clean air filter.


BTW not sure whats up with your tank but I've been on the E for a while (20+ miles with the check guages lit) and the most I put in the car is 13 gallons... my normal fill up on or near the E mark is 12.xx gallons.

Actually i think yours is abnormal... but in a good way. Ive got like 30-50 miles once my light goes off before shes out. Usually once i see it go off, and get pulled over im around 14.25 gallons to fill. Its just the little sensor on the float... you can bend it to change when the light comes on.

I believe the PCM goes to a lame, fuel inefficient mode when O2 sensors are out, which will hurt mileage.:confused:

I believe the PCM goes to a lame, fuel inefficient mode when O2 sensors are out, which will hurt mileage.:confused:

its not the PCM going lame... its just not getting a good read out from the O2's, usually because they get blocked up. The O2's are constantly reading and adjusting the amount of fuel according to your levels in the exhaust... when its lagging its not cutting and adding fuel like it should. PCM is actually getting faulty data, you lose performance and gas mileage.

I get around 21-23 mpg mixed city/highway (highway is 55 mph, has lights). On the way to Phoenix, with no cruise controll, having many times going past 100 mph, and cruising with rpms at around 2200, I got 28 mpg. I actually get better mpg with my 4.10s then I did when I had my 3.42s. Don't know how, I guess driving habbits, but with the 3.42s I was at like 18-19.

The car is 100% stock. I do probably 95% city driving. Good call on the O2's. I didn't even think about this. I'm not throwing any codes at all...? How many should I replace?

Well, here is what I can tell you about my 99Z, A4, 3.23, and stock sized rims/tires. When the car was new, and bone stock, I would get 22 combined city/highway, with best of 29-30 strictly highway, on long trips, at 70-75mph. Now days, I get a maximum of 25-26 strictly highway, with the average still being around 21-22. I attribute this drop to several things:
1. I have ALOT more miles on it now (180k+)
2. The small mods I have made: cowl hood, cat-back, and free ram-air, with no tuning.
3. All fuel is now a mixture of ethanol and gasoline. Depending on where you live, the ratio can be higher or lower. In my area, it is now 10% ethanol.

For those of you who have changed tires or gears, did you have the speedo re-calibrated? If not, your odometer is wrong, and so is the trip OD. The best way I know to check is on a long trip, watch the mile marker signs for at least 20-30 miles, and compare your odometer.

KevinD

City driving. Auto/3.73 gears. almost 90k on the clock. Get's me about 17-18mpg.

your mpg doesn't seem bad..

Well, here is what I can tell you about my 99Z, A4, 3.23, and stock sized rims/tires. When the car was new, and bone stock, I would get 22 combined city/highway, with best of 29-30 strictly highway, on long trips, at 70-75mph. Now days, I get a maximum of 25-26 strictly highway, with the average still being around 21-22. I attribute this drop to several things:
1. I have ALOT more miles on it now (180k+)
2. The small mods I have made: cowl hood, cat-back, and free ram-air, with no tuning.
3. All fuel is now a mixture of ethanol and gasoline. Depending on where you live, the ratio can be higher or lower. In my area, it is now 10% ethanol.

For those of you who have changed tires or gears, did you have the speedo re-calibrated? If not, your odometer is wrong, and so is the trip OD. The best way I know to check is on a long trip, watch the mile marker signs for at least 20-30 miles, and compare your odometer.

KevinD

I never thought about trip OD being wrong after my gear swap.....NO! My calculations are all LIES!!! Fuck the recalibration...I'm happy seeing it at 24 mpg regularly lol.

Actually i think yours is abnormal... but in a good way. Ive got like 30-50 miles once my light goes off before shes out. Usually once i see it go off, and get pulled over im around 14.25 gallons to fill. Its just the little sensor on the float... you can bend it to change when the light comes on.

haha... well.. damn. It sounds like it might be mine!!

Doesn't the tank hold 16.5 gallons?

Doesn't the tank hold 16.5 gallons?

Yeah...

Maybe its just the stock tune on certain cars? I didnt read all of this thread, but my car is stock and it seems to only get like 18 mpg when i drive like a old lady shifting at 2k, and its not like im luggin the motor at all, but it just seems that it should be better.

Maybe its just the stock tune on certain cars? I didnt read all of this thread, but my car is stock and it seems to only get like 18 mpg when i drive like a old lady shifting at 2k, and its not like im luggin the motor at all, but it just seems that it should be better.

This is pretty much EXACTLY why I started this thread. :nod:

http://www.fuelly.com/driver/S8ER01Z/camaro/sig-image (http://www.fuelly.com/driver/S8ER01Z/camaro)

I've been pretty hard on it lately and still seem to be banging out good mileage...maybe it is the tune?? Thought I can't say my car is hurting in performance or has a 'less agressive' tune in it.

yea i have 104k, m6, and get about 17-18 mpg, though i did run auto-rx through it and got 2-3 mpg better afterwards.

getting a hundred and fifty miles on half a tank is good man. I wouldnt be complaining

i got a 2002 camaro z28 with an a4 and 85k miles and i get around 200-240 a tank most the time but on the freeway i took a road trip and actually got 372 out of a full tank and im talking all 15.5 gallons.

My 98 has auto/stock 3.23 gears and 124,000 miles on it and around town I barely get 16 when my foots not to the floor. Around 200 a tank, haven't went on a long trip to see what it gets on the hiway. I did take it to get it scanned and my O2 sensors are out so I'm sure that's why the mileage sucks. I'm sure new O2's and a better tune would help a bunch.