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I’ve started noticing my Altima having not so good gas efficiency and it’s quite annoying. I don’t know what it could be, can someone please help me haha. I’ve tried doing an alignment and getting newer tires but that didn’t work. I need ideas HELP lol.
 

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2002 Nissan Altima 2.5l 5spd
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I recently diagnosed out a similar issue. I approached the issue through diagnostic software to find several areas that impacted my performance (ie. Fuel efficiency, torque ratios etc.). My findings lead to o2 sensors , spark plugs, and coils. Now running at 32 mpg. Hope this helps.
 
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