Interesting Gas Mileage Comparison Between My F-Bodies
11-15-2009, 06:39 AM
#21
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Little late on this but... having an M6 T/A, lid, SLP MAF, no tune, no other mods, and 109K on the clock running about 20/80 on City/Highway I get between 25-27 mpg. I typically do what ZTwentyAteU mentioned which is 2K shifts and ~45-50 hit 6th. I, on the other hand, only use 2/4/6th gear normally. Too lazy to disable skipshift and 1st seems too short for me anyway. Straight highway from Knoxville to Baltimore I was getting between 29.5-30 running ~70-75. People say that these cars like that speed...
11-15-2009, 07:53 AM
#22
1998 Z28 M6, (mods in sig), 136k miles. I average around 20mpg, but on road trips I get around 28 with 4.10 gears. Once, while driving from Roanoke VA to Montgomery AL I got like 34 mpg, but that was a true scientific run 
I had HPTuners open in the seat beside me with a custom MPG PID, I tailgaited semi trucks (thanks MythBusters), and put it in Neutral going down hill. You would be surprised how much a 1% throttle difference can make in fuel economy. When you go down a hill in neutral at 80mph then you really are getting like 100mpg. Anyone that's familiar with the stretch between the top of the mountain in Chatanooga and I 59 ought to remember that long gradual down hill grade that lasts for like 5 miles. If you can travel that whole distance and only spend the fuel to make your car idle then you can really affect the average MPG.
My 1996 Z, with the same 4.10 gears, EWP, UDP, shorties, CAI, "airfoil", Hypertech
, LT4 KM, Borla, would consistantly knock down 30mpg on the highway.
Speed seems to be the biggest mileage killer, as it takes more throttle percentage (thus deeper MAP cells), from my observation. RPM has less of an effect on MPG than you would think...
I had HPTuners open in the seat beside me with a custom MPG PID, I tailgaited semi trucks (thanks MythBusters), and put it in Neutral going down hill. You would be surprised how much a 1% throttle difference can make in fuel economy. When you go down a hill in neutral at 80mph then you really are getting like 100mpg. Anyone that's familiar with the stretch between the top of the mountain in Chatanooga and I 59 ought to remember that long gradual down hill grade that lasts for like 5 miles. If you can travel that whole distance and only spend the fuel to make your car idle then you can really affect the average MPG.My 1996 Z, with the same 4.10 gears, EWP, UDP, shorties, CAI, "airfoil", Hypertech
, LT4 KM, Borla, would consistantly knock down 30mpg on the highway. Speed seems to be the biggest mileage killer, as it takes more throttle percentage (thus deeper MAP cells), from my observation. RPM has less of an effect on MPG than you would think...
11-15-2009, 08:36 AM
#23
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Before my cam I got 30 a few times, with 4.10's! The cam lowered it to about 28. Although I did get 29 this summer on the one trip I took it on. And I got on it a few times. I was impressed
11-15-2009, 09:35 AM
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11-15-2009, 08:50 PM
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With an m6 swap and 3.23 gears I get about 250 miles a tank, its really not all that different from the automatic, except that its alot more fun to drive now.
11-18-2009, 03:37 AM
#26
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My 98 a4 ta with 3.23s gets around right at 21 mpg with lid and lt's untuned. Just took a recent road trip and got around 24 mpg, but I drive the car easy for a 20 year old, no cruise control though so it gets annoying.
11-19-2009, 12:06 PM
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Ouch, that doesn't bode well for me...
My '01 T/A M6 get's around 13mpg right now...only mods are LID and Magnaflow CB. I do drive pretty aggressively, but my 94 LT1 (M6) under the same driving got 18-21mpg.
No check engine light or anything.
My '01 T/A M6 get's around 13mpg right now...only mods are LID and Magnaflow CB. I do drive pretty aggressively, but my 94 LT1 (M6) under the same driving got 18-21mpg.
No check engine light or anything.
11-19-2009, 12:28 PM
#28
My 2002 3.8 litre camaro gets around 33 on the highway... I put about 430 miles on the tank with an average speed of about 105-110 and when I did math on it, it said 29.98 mpg at an average speed over 100mph...
My Z28 has gotten as much as 360 miles to a tank, before the tune up. I'm hoping a tune on the Z28 should get me around the 29mpg area, right now highway is looking to be about 26mpg A4 3.23.
My Z28 has gotten as much as 360 miles to a tank, before the tune up. I'm hoping a tune on the Z28 should get me around the 29mpg area, right now highway is looking to be about 26mpg A4 3.23.
11-19-2009, 01:23 PM
#32
Actually, I think it may be illegal and bad. I know in a big truck its illegal, and if your caught doing it, its something to be pulled over for. They consider it "not being in control of your vehicle". I'm just assuming its similar in a passenger car...
11-19-2009, 03:05 PM
#33
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http://www.driverside.com/auto-library/hypermiling-195
11-19-2009, 03:30 PM
#34
On the legality of the issue I am not sure, but it is a standard technique to hypermilers...
http://www.driverside.com/auto-library/hypermiling-195
http://www.driverside.com/auto-library/hypermiling-195
Basic: Coast to a stop with as little braking as possible and go slow enough around corners that you don’t need to brake. Coast down hills by laying off the brakes and gas, and push in the clutch if you’re driving a manual.
So lets just burn up the clutch....
Hardcore: While gliding, put the car into neutral and wait until you hit a low speed of about 15 mph under the speed limit. Shifting into neutral increases fuel efficiency, but means you don’t have complete control of your vehicle, which is dangerous and illegal in some states.
Like I said, Its not legal for truckers, and some states for cars eaither since you lose "control" of your car...
Good read though thanks for the link.
11-19-2009, 08:24 PM
#35
I don't know how they would ever find out, unless they pulled you over for not sounding loud enough, lol.
The only time that I tried it was when I had HPTuners open logging MPG on a road trip. I was definitely avoiding the law on that trip while tailgaiting... but not tailgaiting at 5 feet, more like 25 feet.
How would you burn up the clutch in neutral (assuming your clutch fully releases)?
The only time that I tried it was when I had HPTuners open logging MPG on a road trip. I was definitely avoiding the law on that trip while tailgaiting... but not tailgaiting at 5 feet, more like 25 feet.
How would you burn up the clutch in neutral (assuming your clutch fully releases)?
11-19-2009, 10:17 PM
#36
I don't know how they would ever find out, unless they pulled you over for not sounding loud enough, lol.
The only time that I tried it was when I had HPTuners open logging MPG on a road trip. I was definitely avoiding the law on that trip while tailgaiting... but not tailgaiting at 5 feet, more like 25 feet.
How would you burn up the clutch in neutral (assuming your clutch fully releases)?
The only time that I tried it was when I had HPTuners open logging MPG on a road trip. I was definitely avoiding the law on that trip while tailgaiting... but not tailgaiting at 5 feet, more like 25 feet.
How would you burn up the clutch in neutral (assuming your clutch fully releases)?
11-20-2009, 12:53 AM
#39
It would probably be better on the tranny to coast with an auto then with a manual.... either way riding the clutch is not something you should do.
And coasting in neutral is illegal in some states and illegal for big trucks to do in all states pretty much.
And coasting in neutral is illegal in some states and illegal for big trucks to do in all states pretty much.