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Why is my truck getting horrible gas mileage?
I own a 1992 S-10 with the 2.8L V6 5 speed, I was getting between 28 and 30 MPG no joke, and now its getting like 15-16 MPG!!! the only modification i have done with the truck was build a custom exhaust for it, im in college and i commute daily to school and it seems like i can watch the gas gauge go down, and its all free way i don't speed or race around i just cruse so i don't know what the deal is, it seems like its running rich because the air filter smells strong of gas which is unusual but it does not smoke at all or have the black exhaust tip like you would see on other cars, my friend said it might be the O2 sensor but im not sure, please help anyway possible thank you
The exhaust should actually help with gas mileage because it helps with the air flow of your car. check you air filter for it is probably pretty dirty. change the filter with a k&n air filter, it will help with gas mileage and give you a bit of a horse power boost 
. but also check your tire pressure and change your fluids. it will help your truck run more efficiently and therefor create better gas mileage. if your o2 sensor were to be going bad, you would get a check engine light. good luck with your problem, i hope this helps.
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