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Gas Mileage Issues on my 04 X5 4.4L Gas Mileage Issues on my 04 X5 4.4L
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Old 11-16-2009, 02:28 PM
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Quote:
Originally Posted by prwdmd View Post
Another thing that could affect fuel economy would be the O2 sensors. At your mileage they are probably on their way out, but will continue to work for some time before throwing a fault. There are four total... I plan on doing mine in the near future.
This is where I would start as long as air filter, fuel filter and plugs are new. Also, are you sure you are running the correct air pressure in your tires?
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