Does anyone have any ideas as to why the GTO gets the gas mileage that it does? On the highway I am getting about 22 mpg. My '02 vette gets 31 mpg. What is the rearend ratio in a GTO. I know that the GTO is pushing more air, but 9 mpg difference between the two cars seems like a lot. What is the GTO's coefficient of drag? By the way, around town mileage is horrible (about 13 mpg)....but the weight of the car and my driving habits can probably explain that.
Poor Fuel Mileage
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I'm in the same boat man. Went from a 98 Vette which I got 16.5 in town driving, now i'm at 12mpg. I'm hoping it gets better once the engine is broke in. It is geared lower that the C5 at 65 in the Vette I was at 1250rpm, at 65 in sixth gear in the GTO its closer to 1500rpm. .
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If you had an auto C5, the gear ratio was 2.73 rears or if you had the performance rear it was 3.15. Now you have a 3.46 rear. Stick versus stick the rear is the same, the tranny is slightly different. That would explain a small amount of difference. I'm not sure why the GTO gets such bad mileage. My 02 Z28 with an A4 and 3.08 gears with 335 RWHP got 29-30 on the highway and 19 in town. My Z06 C5 got 18 in town and 26-27 on the highway. The GTO is getting 17 city and 22-24 highway with the same type of driving. I think the weight has something to do with it, but that can't explain all of it. The CD is good for the GTO and matches the C5, but the GTO does have more frontal area. Still it shouldn't be such a large difference IMO. Oh well, I didn't buy the car for mileage, so I can live with it I guess.
I probably have more seat time in the GTO than just about anyone in the US, and I can say without question that it's the around-town / slow traffic driving that kills the average mpg in these cars....I blame the work required to get two-tons of metal and glass moving...taking some care and shifting efficiently helps a lot. This car is fun to yank thru the gears, however, so that is exceedingly tough to do.
I seriously doubt dinking with the tall gear ratios will help much.
I have seen posts where some people claim 29 mpg averages...of course, some people claim they've seen Bigfoot as well.
I seriously doubt dinking with the tall gear ratios will help much.
I have seen posts where some people claim 29 mpg averages...of course, some people claim they've seen Bigfoot as well.
19 - 21 mpg
I commute 108 miles per day and a good 30 of that is in stop and go traffic. Avg speed for a tank of gas is 39mph and depending on how much I endulge when not in the bumper to bumper stuff, and I get 19 to 21mpg per tank. I took a road trip from Pleasanton CA to Pasadena CA, 350 miles, and did get 29mpg. I agree with Groucho, the stop and go really kills the mileage.
I commute 108 miles per day and a good 30 of that is in stop and go traffic. Avg speed for a tank of gas is 39mph and depending on how much I endulge when not in the bumper to bumper stuff, and I get 19 to 21mpg per tank. I took a road trip from Pleasanton CA to Pasadena CA, 350 miles, and did get 29mpg. I agree with Groucho, the stop and go really kills the mileage.
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Just took an 800 mile trip. I found that if I set the cruise at 70 and turn the Valentine off (it just forces me to go) I get 25 mpg. At my normal 80-90 cruise I get 23. But about 250 miles of this trip was rural hwy with 55 mph speeds. I kept the cruise at 62 and was amazed to get 28.5 mpg. The computer showed 27.9 for that leg, but when I actually calculated it, 28.5 is what it was.
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Mine is 1 week old and is getting 12 mpg. Its an improvement for me over my 2500 Subn. so I really dont mind it at all.
What a bunch of suck tits on here. you have a high performance car that weighs 3800 lbs and you complain about 22 miles per gallon? Good God, go get a toyota if that is your thing. My GTO gets better mileage than my 4 cylinder EVO. If you can't afford to put gas in it, look for another car.
Goat Boy
Goat Boy
So why not get rid of your 3:46 gears and get some 4:56's......and while your at it, yank out your 6-speed and put a powerglide in.....and lower the tire pressure, and rip out the interior to save weight. All that matters is acceleration...right?goat boy said:
I drive my cars everywhere, including 1,000 + mile road trips. If I can do something to get a couple more miles to the gallon, while more or less getting about the same acceleration....I will.
mzr3yt said:
You've gotot be kidding... I know I did'nt buy this car for fuel mileage;
don't get me wrong I'm not trying to knock anyone, but If you did ya probably bought the wrong car.... and besides 3.46 gears are lower, your making more horsepower than your 02 vette, and the vette weighs less. I know gas is expensive, but just drive and enjoy. :cheers
I think I drive mine pretty hard but I've never seen my average down to 12mpg!! I average 16 to 17 around town.Took methodical approach to engine break-in on my new '05. See LS-2 Engine Break-In post of mine.
After 900 miles I'm getting avg. of 12.4 city, 21.4 hwy. I don't race hard, but can't resist pushing it frequently.
Seems this motor stock is going to get those figures on average. Next week my new KNN arrives so I'll let you know how that helps.
After 900 miles I'm getting avg. of 12.4 city, 21.4 hwy. I don't race hard, but can't resist pushing it frequently.
Seems this motor stock is going to get those figures on average. Next week my new KNN arrives so I'll let you know how that helps.
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Mlieage will ALWAYS get better as the engine breaks in. Std trans usually will do better than an auto.C5ORGTO said:
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