gas mileage

Hmmm... Well, I'm on brand spanking new iridum plugs, wires, air filter, fuel filter, O2 sensor, MAP sensor, IAC controller, PCV and EGR valves, intake manifold gasket, exhaust gasket, supercharger gasket... (not to mention 5,000 mile old Michelins all around on a recent balance and rotation). You'd think I'd be getting better than 24.x. Though I'm still getting the Check Engine Light every time I touch the car and maybe the MAF is suspect, since I'm running out of candidates. Would that be having a big impact on fuel economy?

What code do you get? And yes, MAF affects fuel mileage, along with other things

Question for anybody...I'm in Ohio. Does running 89 fuel vs. 93 fuel make a difference in fuel economy. I'm still running around 18 to 19 mpg on completely stock. Thanks in advance.

Shouldn't effect mpg much.
Will effect piston life.

Actually I think it does affect fuel economy cause timing decrease and the increase in kr in forced induction motors

You would probably never notice the increase.. But it could save your Pistons so that alone makes it worth it.


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I think he was asking about a GT? If it is supercharged, it is much safer to run 93 than it is to run 87 or 89. In a GT, (Naturally Aspirated, except for the non-fleet 2006 - 2007 GT's that came supercharged), I'd just run the 87 or 89 since the higher octane won't matter as much in a N/A engine

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Originally Posted by tomtom123

What code do you get? And yes, MAF affects fuel mileage, along with other things

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The most evil code of them all; P0171

A thought too - whenever I start the car I get a very audible clacking sound from the engine bay which I have always assumed was just the lifters. But Lucas hasn't quieted the problem even a bit. It always goes away after a bit of driving but it is definitely affected by any level of acceleration until it does.

Could I be looking at an injector problem?

check for vac leaks and try the maf un plugging trick, unplug it, then start the engine.

Plug it back in while it's running?

Unplugged it and it ran normally for a few seconds until it the engine started to sputter.

Edit: Code didn't go anywhere.

29.2 is the highest I have gotten so far... this is very little city and almost all highway. Premium 93 or 91 octane gas. So far I am happy with it.

i run 87 in my car, still get 35 on the highway if i drive it right. then one morning warmup its back to 20s, until you reset it going down the highway.

My stock white gtp gets about 17-18 city driving civilized and i don't know what it gets on the highway because I have yet to drive it on the highway.

My rusty blue gtp is rock solid at 19 mpg all city with me constantly beating on it (has a 3.5 and headers/needs retuned) and last time I had it on the highway (few years ago when I got rid of it) it would get 31 mpg all day long and 35 mpg without the hood

MY average MPG in my 2000 GTP is 28 on the highway with cruise control on at 80. In the city I get about what you stated.

My gas mileage right this second is Ohio State just whipped Alabama!! Roll tears roll!!

Woohoo!

And yet everyone talked about how Alabama wins everything :cool:

my gas mileage (95 octane) is rated at 24-25 mpg in the city, on the Highway(Autobahn) between 15-17 mpg Dia higher at the highest speed.

ok speed limit? Is sealed off at 110 miles, :auto1:

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Originally Posted by Pontiac GP

my gas mileage (95 octane) is rated at 24-25 mpg in the city, on the highway between 15-17 mpg Dia higher at the highest speed.

ok speed limit? Is sealed off at 110 miles, :auto1:

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That sounds kinda backward but maybe I read it wrong. I'm just trying to figure out for the life of me how to get some better fuel economy out of this thing. I'm not complaining too much though because it's getting the same if not better than my old 2002 S-10 LS 4-cyl.

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Originally Posted by 1BadGT

That sounds kinda backward but maybe I read it wrong. I'm just trying to figure out for the life of me how to get some better fuel economy out of this thing. I'm not complaining too much though because it's getting the same if not better than my old 2002 S-10 LS 4-cyl.

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:th_sign-oops:sorry
read incorrectly