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What can make my gas mileage suffer so bad that it has fallen from 30-33mpg to 26-28mpg? On top of that, power is down. No check engine light is coming on...would it help to bring it to Nissan and have them diagnose it?
 

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winter gas is formulated differently for less pollution. usually decreases power some and mileage as well.
 

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But I don't know if its possible for gas mileage to suffer that much. I used to be able to go 350 miles to a tank easily, and now I can barely go above 300.
 

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I'm having the same problem with my 1990 Stanza XE engine runs fine but gets really crappy mileage and NOT blowing black smoke indicating a very rich mixture. There is black soot in the end of the muffler so i know its running somewhat rich. Would changing the O2 sensor or as the manual calls it the exhust gas sensor?

Robert :cheers:
 
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