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Discussion Starter #1
so im getting around 21.6 regardless it be driving around town or on long distance trips... what can i do to improve this... FPR, fuel filter, and i hope it's not a fuel pump because that would just be a P.I.T.A... what would you guys suggest doing?
 

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Does your car get to operating temperature? If your thermostat sticks open the car will never reach operating temperature and therefore run on the preset fuel values.
 

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Discussion Starter #4
my thermostat is new... as far as 02 sensor's... do i just need to clean them or fully replace? and do both of them need to be changed?
 

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They are cheap enough so just replace the front one. The 2nd one has no effect on the engine as it's just to monitor how well the CAT is working.
 

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Discussion Starter #9
i change my plugs about every 7000 and filter i just cleaned... so ill try the 02 sensor... and go from there... thanks... if this doesn't work maybe ill do a fuel filter or something...
 

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O2 sensor governs your fueling for the majority of driving so it's the first suspect when MPG drops significantly.
 

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Do you simply replace it? Or can it be cleaned or checked. I had some alternator problems and the mileage dropped from 20-22mpg mixed city/highway to 15mpg. Now that the alternator's been replace it only up to 17-17.5mpg. And it's the same city traffic or on the highway according to the SID.

How an alternator can affect mileage is beyond me, though there was a direct effect. It would create overvoltraged and erratic voltages, so I guess it could throw-off the readings. How difficult to change by myself? They hosed me for the alternator swap-out....but I needed the car fixed and reliable.

.....And I couldn't stand the damn*d warning chimes any longer.
 
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