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I'm getting only 14mpg on this 2.4cyl car when it is supposed to get near 24mpg/city. The engine light has never came on.it runs great. I have had it checked by numerous mechanics including Nissan but none can find a problem.
Is it possible to have a bad O2 sensor without the engine light coming on? Could it be something else that is causing such poor gas mileage that might have been overlooked?