i dont check every tank in town cause i dont always fill up, but every time i fill up i reset my trip meter, and every trip i take i check it. not a guess i do the math every tank on a trip, my car has never ever got less than 27, avg was 28 @ 90. like stated above the one time i drove the speedlimit for a hole trip it got over 30 the whole trip and as much as 33. and yes wind has been factored in several times, as OK is pretty windy and i traveled it SW corner to NE corner many,many times to and from OH. as i said befor, lsx and a 6 speed is bar none the best power/economy combo ever. IMHO

 

When i was stock 27mpg!
After mods w/o a tune 10mpg hwy.
After mods and tune 26mpg!

 

VERY NICE!

 

My stock WS6 A4 gets about 18 MPG in mixed driving. If your f-body gets 30 MPG sell it because you need to drive a Civic!!! I've never bought a sports car and then worried about MPG. I want to be able to light the tires up whenever I want and pass anyone I want.......drive your car the way it was meant to be driven!!!!!

 

Why get a Civic when you can have the best of both? My wife's Civic has yet to break 33mpg in the 8,000 miles we've owned it. I'd take an average 5mpg penalty to avoid driving an underpowered tin can on wheels.

It's been said here several times, these cars offer the best power/economy balance out there.

 

Several people have called BS on the claims of 30+ MPG and I'd like to say that when I pump my tires to 45 lbs and I coast down hill with a swift tail wind and the moon is in an absolutely perfect position creating the exact gravitational pull necessary to optimize mileage, I get 200 MPG.

I'd like to say that but it'd be BS, just like a lot of the other BS in all of these gas mileage threads. My bone stock M6 never got more than 24 MPG in absolute 100% egg under the pedal highway driving. I have always gotten around 12-15 around town with combined driving, and my mileage has not changed with the addition of 4.11 gears, cam, heads, long tubes, a dual dual exhaust and a tune that has my AFR right on the money (14.6) at and below cruising speeds.

I have offered to any f-body LS1 owner that if they can prove 30+ MPG I'll pay for the gas and pay $100 to anyone in my area who will fill up in my presence letting the pump shut off automatically, drive with me for at least 120 miles, return to the same gas pump and fill up allowing the pump to once again shut off automatically. On the other hand, when they do not get the 30+ claimed mileage, they owe me for the gas and $150. Stock tire height and width, tire pressure cannot be >32psi and the motor must run at all times during the drive and no coasting with the clutch pedal depressed.

 

I dont know about 31, but I seem to remember a long time ago when my car was stock with just lid, MAF and TB getting around 28mpg on highway trips. Now, I am lucky if I get 20mpg. But hey, if I wanted better gas mileage I would drive my girlfriends Honda Civic and feel like a tool doing it. Maybe your friend has a Honda motor in his car

 

This goes to show that the tune means a LOT. And like I said, rotating weight has a lot to do with it too. You're going to get better mileage with 16's than you are with 17's or 18's. Aftermarket steel driveshafts hurt, bigger brakes hurt, etc. 12-bolts and 9" suck it up too, even more so if you go with a shorter gear. Even minor aero differences will be noticeable at 80+. A Z28 with no ground effects should do better than an SS, etc.

Also like posted above, many of these cars were rated at 28mpg highway from the EPA, and it seems that those highway numbers are often a bit low...so we aren't the only retards behind the calculator. My buddy just picked up a Pontiac G6, and they are rated at 26mpg. He went to Colorado and back (2000 miles) and pulled off an average of 29mpg. He got 31mpg yesterday on his way to Lafayette and back. His math seems to match up with the in-dash economy computer.

I don't understand the comments of people saying if you get close to 30mpg on the highway in an LS1 car why you should drive a Civic? Should I constantly be in 4th gear when I'm on the highway? Or should I constantly be going from 60-100-60-100-60-100 as quickly as I can? Pegging the speedo? I don't understand your reasoning. I didn't realize that owning an LS1 means I should be driving like a jackass on highway trips.

I will however say that I do also have a '95 Civic that I picked up a couple months ago to replace my gas-hungry Blazer as something to drive when its not nice enough to take the Z out. This car is pretty unpredictable for highway mileage and I'm not sure why yet. Maybe because its like cruising down the highway in a styrofoam brick (not aerodynamic and light as hell), so wind has a huge impact, I'm not sure. One tank on the highway it'll be 43mpg, the next it'll be mid 30's. I've tried the same pump, multiple pumps, doesn't seem to matter. City mileage is a consistent 28mpg though, so I'll probably be driving this back and forth the couple miles to work every day rather than the 14-16 I get in the Z.

 

i get 28 @ 85 on the highway. in town it depends on how i drive it but its usually about 18ish!!!! gotta love that six speed and 3.42's!!!!!!

 

You're in Colorado, that mileage must be when you are going down the mountains coasting, right? lol

 

^^^sounds right on par to me, and those damn civics are about inconsitant as **** huh. always good but sometimes just great. then just good again.lol

 

all depends on the driving. I drove 65 miles to work going 65mpg, Wont do that again took to long not worth the savings, and i got low 30's 31-32.

 

i have to drive mostly city, and the times im on hw its usually alot of traffic in rushour here in memphis

i calculate every single tank of gas to milage. my lowest to date is 13.1, highest to date was 18.5. average is usually mid to low 14mpg.

not too bad for a big came and tall gears and over 400 rwhp if ya ask me.

 

Driving home from picking it up, just about 100 miles I averaged a tad over 30 mpg. Cruising in 6th gear at 75mph

 

Same here

 

If you are driving your f-body to get 30 MPG you can't be enjoying what makes these cars fun!! My A4 ws6 averages about 18-19 MPG, I'm sure I could do better but the temptation to drive the car hard is toooooo much. In a Civic you would not have that issue unless you have a fart pipe on it.

 

i get about 22

 

my last big trip in it while still stock was 660 miles (almost all interstate at 78-80 mph). i AVERAGED 30.0 to the decimal. now i get about 10!!! damn turbo.

 

Maybe this is the understading everyone is having. I got mileage in the highest category on one highway trip. I've also worn out a set of tires in less than 20,000 miles and broke a tranny mount. I regularly get low 20's from mixed agressive driving, one in a while into the 18-19 range. Does it still sound like I should drive a civic?



All I've said is that may car is capable. Besides, when I do get on the highway and drive 'as it's meant to be driven', even though I'm 90% stock, I'm still one 10 second burst of WOT from legal to more than double that. I like driving my car much more than being locked up for reckless driving.

 

I still don't get your reasoning...