My 04 Jeep Grand Cherokee V6 4wd is only averages 6 mpg what could b the problem..
Are you running factory size tires? Was air, fuel filter changed? Correct tire pressure?
Check your miles odometer when you park the car. Then check the odometer when you get back in the car, they should match. Just saying. Some one may be using it while you are away. Also make sure you have no leaks. Does your service engine light come on, then go out after a while. If so your oxygen sensor may be bad.
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