I just did a full tune up on my 2.4 but my gas mileage hasn't returned completely yet. I just did a 500 mile round trip and only averaged 21.5mpg. I normally get 23 mpg with mixed driving. I recently changed my fuel filter and my air filter, is there anything else that could be affecting it? I did just go from 225/70's to 235/75's, but I don't think that is the problem since it really started before this.
Gas Mileage Question
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281 Posts
What was in your tune up? "Tune up" can mean different things to different people.
Other things I can think of (although some of them are pretty unlikely)
tire pressure
correct spark plugs
thermostat (is it running too cold?)
MAF sensor
o2 sensors
clogged cats
slipping transmission
dragging brakes?
Other things I can think of (although some of them are pretty unlikely)
tire pressure
correct spark plugs
thermostat (is it running too cold?)
MAF sensor
o2 sensors
clogged cats
slipping transmission
dragging brakes?
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3,063 Posts
how about running seafoam?
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58 Posts
Going from a 225/70R15 (approx 27.5" o.d.) to a 235/75R15 (approx 29" o.d.) will affect your speedometer and odometer accuracy. 1 1/2 inches will show your are going slower than before and going fewer miles. Your gas mileage probably won't be that much different if you can figure out how to factor the difference in tire o.d.
Go Here to calculate your difference in speedo with bigger tires.
Tire Size Calculator - tire & wheel plus sizing
Tire Size Calculator - tire & wheel plus sizing
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