Whats your mpg?
Teching In
Joined: Mar 2006
Posts: 31
Likes: 0
Originally Posted by cyamaha2007
man my mpg sucks i get about 12.5 mpg mostly highway 
about 75/25 does anyone know what might be wrong please help me out shoot me a pm its a 95 trans am
about 75/25 does anyone know what might be wrong please help me out shoot me a pm its a 95 trans am
- just bugginghave you had recent tune up? injectors purged?
My mpg seem to be dropping as I put miles on my car (and yes, I have kept up with the maintenance). When I first bought it (with 25k miles), I could get ~30mpg on highway trips. Now (with almost 80k miles) I can't seem to get anything better than 24mpg.
Teching In
Joined: Mar 2006
Posts: 31
Likes: 0
Originally Posted by Turo
My mpg seem to be dropping as I put miles on my car (and yes, I have kept up with the maintenance). When I first bought it (with 25k miles), I could get ~30mpg on highway trips. Now (with almost 80k miles) I can't seem to get anything better than 24mpg.
when my engines got slap they lost alot of millage.
TECH Apprentice
Joined: Jul 2003
Posts: 358
Likes: 0
Originally Posted by Turo
My mpg seem to be dropping as I put miles on my car (and yes, I have kept up with the maintenance). When I first bought it (with 25k miles), I could get ~30mpg on highway trips. Now (with almost 80k miles) I can't seem to get anything better than 24mpg.
Keep in mind that EPA estimates are based on vehicles driven/tested on a 'closed course' and they are not generally accurate for most drivers.
Wish I could drive as easy as you can friend.
I would think that 24mpg is normal for your miles and your car.
Originally Posted by friendswoodgto
I have a 2004 GTO and I get 13.5 or less on 100% city driving (stop and go, surface streets,) 13.7 this past week when I really babied it. On 100% highway driving, I get 26.
When I did my homework prior to purchasing the car this past April, based on EPA mileage estimates and polling some LS1 owners at work, I projected 15 or 16 in town, which is what I would find satisfactory.
I find the 13 very disappointing and really the ONLY negative about an otherwise outstanding car. Any suggestions on what might be wrong? The car is stock from a performace standpoint, with the only mods being window tint, skip-shift and B&M shifter.
I'd appreciate any help.
Best regards,
Jeff T.
When I did my homework prior to purchasing the car this past April, based on EPA mileage estimates and polling some LS1 owners at work, I projected 15 or 16 in town, which is what I would find satisfactory.
I find the 13 very disappointing and really the ONLY negative about an otherwise outstanding car. Any suggestions on what might be wrong? The car is stock from a performace standpoint, with the only mods being window tint, skip-shift and B&M shifter.
I'd appreciate any help.
Best regards,
Jeff T.
Well... I'll list the most simple things you can do.
1: Check Tire pressure- It is true if your tires are off a few PSI it will affect your fuel economy alot.
2: Clean you air filter/ replace it with a new one
3: Try to shift earlier if you are babying it
4: Run some fuel injector cleaner through it. ( A product called seafoam works great ,just dump the can in a full tank and it will work its magic)
If it comes down to it, usually an aftermarket intake/exhaust will help fuel economy but will come at a cost.
Good Luck
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TECH Resident
Joined: Aug 2003
Posts: 970
Likes: 4
From: England UK
2000 Trans-Am before mods, best I had was 29 MPG on the highway at 60mph, this was averaged over a full tank. Worse average over a full tank was 5.8mpg, this was a silly speeds back from the airport when not much other traffic on the road, my full tank of fuel lasted less than 50mins.
After mods not done a full tank average, about 16mpg around town, 24mpg on the highway. During heavy acceleration 1.05mpg in first gear and 2.2mpg in 2nd gear.
After mods not done a full tank average, about 16mpg around town, 24mpg on the highway. During heavy acceleration 1.05mpg in first gear and 2.2mpg in 2nd gear.
TECH Enthusiast
iTrader: (6)
Joined: Oct 2005
Posts: 669
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From: College Station/La Porte, TX
Originally Posted by losiguy
Well... I'll list the most simple things you can do.
1: Check Tire pressure- It is true if your tires are off a few PSI it will affect your fuel economy alot.
2: Clean you air filter/ replace it with a new one
3: Try to shift earlier if you are babying it
4: Run some fuel injector cleaner through it. ( A product called seafoam works great ,just dump the can in a full tank and it will work its magic)
If it comes down to it, usually an aftermarket intake/exhaust will help fuel economy but will come at a cost.
Good Luck
1: Check Tire pressure- It is true if your tires are off a few PSI it will affect your fuel economy alot.
2: Clean you air filter/ replace it with a new one
3: Try to shift earlier if you are babying it
4: Run some fuel injector cleaner through it. ( A product called seafoam works great ,just dump the can in a full tank and it will work its magic)
If it comes down to it, usually an aftermarket intake/exhaust will help fuel economy but will come at a cost.
Good Luck
I get about 16 mpg on avg with all city driving.
assuming you run z-rated performance street tires, run them at 35 psi. most tires like that will be rated 30-35 anyways. and a few extra lbs never hurt anything, these tires dont balloon out like soft wall tires do.
Originally Posted by y2konyxss
piston slap?
when my engines got slap they lost alot of millage.
when my engines got slap they lost alot of millage.
Originally Posted by BigDaddyZ28
If you ever really got 30mpg, You were doing slightly better than the EPA estimates that GM published in their literature for our cars. (29mpg hwy)
Keep in mind that EPA estimates are based on vehicles driven/tested on a 'closed course' and they are not generally accurate for most drivers.
Wish I could drive as easy as you can friend.
I would think that 24mpg is normal for your miles and your car.
Keep in mind that EPA estimates are based on vehicles driven/tested on a 'closed course' and they are not generally accurate for most drivers.
Wish I could drive as easy as you can friend.
I would think that 24mpg is normal for your miles and your car.
). Now, in the same scenario, I get 22-24mpg ALL highway. 
When I picked my car up(in sig) on June '06(stock) I drove 1000 miles between 70-90 with a couple fills averaging 28 mpg. The first fill was at slower speeds and with a tailwind I averaged 30 mpg! Its flat and windy in the midwest
but its good for mpg when the wind is behind you.
but its good for mpg when the wind is behind you. 
damn i wish i got that good of gas mileage-my car bone stock 220miles to a tank wich averages around 14 miles per gallon in city and 20 on the highway. i also have to add 2 quarts of oil after 1500 miles of driving. car has 50k on it. doesnt smoke or anything. no ses lights or anything.
15 in the city, a little better than 20 on the highway. Can't really tell though because can't keep ,my foot out of it. Conservative 3 BAR SD tune, 114 LSA .222 .224 .568 .574 cam, twin turbos, 93 octane, M6 tranny. My gas milage isn't much worse than when the car was stock as long as you keep your foot out of it. 60 lb injectors.
