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Originally Posted by SleepOnDreams
Anyways I only get about 15-18 mpg in my 99 4.0 OHV XLS, but that's alright I guess, what parts would you guys suggest adding to my car to increase gas mileage? I've got money to throw around right now, about 400, and in two weeks, near a thousand, but don't know what to get... any suggestions for increasing fuel economy?
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Hi
I just want to point out that you're comparing 2 very different engines. You have tha OHV and most people here are talking about the SOHC, which is a more modern engine that
should have a noticeably better fuel economy. So don't feel bad about your figures, I think they're OK.
Also, it's not the brand of gas that you use what affects consumption, but rather, the octane of the fuel you put in your car. The lower the octane the worst the fuel economy, because the PCM has to keep retarding the timing to avoid detonation (pinging). Low octane fuel also speeds up the formation of carbon deposits in the intake side of the engine (throttle body, manifold, etc) restricting the amount of air the engine gets at any given time and therefore affecting fuel economy. cheers
Marc
