gas going going gone?

[540James]

what could be causing my gas to last 1/2 as long. i have unichip but when i first put it on, it didnt eat gas like my car eats it now. maybe plugs/wires? just did an oil change. any gas saving comments would be appreciated thanks

[BOOSTR]

Are you sure your not driving it differently? How much more boost are your running it at now versus before. Even a car with bad plugs, air filter, low tire pressure, and a clogged PCV shouldn't be using gas at the rate you have described.

[toucci]

are you using actual mileage numbers to come to the conclusion that your mileage is poor? the gauge is a very inaccurate measurement of how much gas you are using. It likes to jump around.

[540James]

that is a good conclusion, i will keep an eye on my mileage and let u know

[orng1]

I usually get about 300+ miles to 11-12 gal of gas. As long as you keep doing the gas conmsumption test you'll be able to maintain an idea of how your car is doing. If it starts to go low very quickly then you've got a problem and need to fix it quick. Chech tires, condition of oil(try to keep track of the miles on your oil) air filter. If you've gone through that you maybe looking at a bigger problem. gal/miles= gas milleage

[Moeed]

Also, depending on your mileage, your primary o2 might be needing a replacement.

[Boston5761]

Didn't read all of it, is there a CEL?

[CitizenPro]

When i removed my Unichip, i got much better gas mileage.

[Yellow MSP]

When i removed my Unichip, i got much better gas mileage.

Is this because you were running a higher PSI with the chip, and so needed more fuel...and now you keep off the boost? Or because the Unichip runs rich to keep your engine safe, and now you are properly tuned running a bit leaner?

Anyways, one of the biggest killers of MPG is if the front O2 is dead. Maybe not half as much MPG, but certainly less. Others (although there are many more): air filter, fuel filter, dirty injectors, bad ECU, low tire pressure, riding around with 1000 lbs of concrete, and most importantly a heavy foot. To get the best gas mileage possible, all of the things mentioned above should be either replaced or cleaned (especially the heavy foot) and even running synthetic oil is supposed to help, as I believe it is more viscous, which equals less friction, which equals happy engine internals, which equals better gas mileage. I don't have any numbers for this (the oil difference), but it makes sense anyways.