Thread: mpg?

so i have been doing some research and i can not figure out why almost all u guys get decent gas mileage and i get like 18mpg, drove 2 hours on the exspress way and got it up to like 19.7....any suggestions?

wow thats weird, i get like 27-29 on the highway. are u going by what that little on board comp is telling u? those are never really accurate.

Originally Posted by a98gtp4u

wow thats weird, i get like 27-29 on the highway. are u going by what that little on board comp is telling u? those are never really accurate.

Lucky. I'm getting about 12 mpg city. The DIC says 16, but that's bull****.

well bensett, you could always just trade me gtps. i get 28 highway

Originally Posted by 00SilvermistGT

well bensett, you could always just trade me gtps. i get 28 highway

lol yah if it was a 4 dr

when i finally got my car tuned to get more timing when cruising i got 26mpg when i ran straight highway, but i normally would get 21/22 mpg with a mix of both.

Originally Posted by Bio248

when i finally got my car tuned to get more timing when cruising i got 26mpg when i ran straight highway, but i normally would get 21/22 mpg with a mix of both.

and you had 3.29's

mpg has alot to do with driving technics

Used to get 23mpg (even when mashing the gas) with fuel logs & port. Getting 18mpg on stock rails now >_<

i have done the battery thing,and i have reset it, and thats what im going off the digital thing, i drive good, i mean once in awhile i get on it but not alot, when i went on that drive, i set the cruise at like 73....just dosent make sense, i am about to get a dhp power tuner so maybe that will help

Well, you are right, you are getting pretty low gas mileage. Consider the fact I don’t know much about your car, except the mods you listed. I’ll start off by saying, those wheels on your avatar don’t appear to be stock size. And if the tire OD is off, so will DIC mpg. Now on to some tips, because no one so far has given even one! Lol

1) New spark plugs
I’d go with AL606 plugs. Going to an unnecessarily colder plug can hurt your mpg.
2) Clean your MAF
3) Replace your O2 sensor (if your over 100K)
The accuracy of the exhaust manifold sensor O2 sensor is critical in getting good mpg.
4) Run your tire pressure about 32-33 psi

When you unplug the battery for sensor replacement/cleaning, your car will re-learn and then you should be good.
Also, since I see you just posted again. Mpg isn’t magic, it has a lot to do with plain facts. How fast are you going with how fast your engine is turning. No car gets its best mpg at 73mph, try 68mph and see what you get.

I have a major vac leak, would that be causing my mpg to drop alot?

Originally Posted by Liquifire

and you had 3.29's

for sure. if i had 2.93s it would have been even better. you need to run more timing when youre cruising to get good MPG.

Originally Posted by BwolfGT

I have a major vac leak, would that be causing my mpg to drop alot?

yes.

tire pressure on the tires say 51...and how do i clean the maf? also i dont think i have 02 sensors, but there is no service light, well there is but not for that, it says egr flow insuficent? what does that mean?

Your stock recommended tire pressure should be about 30psi, your tire is probably rated for 51 psi max. I have actually experimented with tire pressures a lot. In my experience 32-35psi is where y0ou want to be, but winter is upon us so 32psi better, if you plan on stopping in the snow. And besides you’ll only get about .1 mpg per 2-3 psi increase past about 32 psi in my experience. More over, not even many of the fool hyper-milers run over 50 psi. Trust me, if you like stopping your vehicle don’t go over 40 psi.
Your EGR leans out your AF ratio, that alone might be your problem. If you check engine light is on, you need to tell us! Your car most likely is running rich, in other words your using more fuel than needed. I don’t have much experience with EGRs, but I’d start by checking it for blockage. And replace it that doesn’t work. EGRs can’t cost much.