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my 89 lx hatch 5.0 auto was getting 19-20 mpg all day long like clock work. last week it sat for a week while i was waiting on a window motor transplant......i started driving it again put a fresh tank of gas in it from the place i always get my gas a sunoco station and i always put 89 octane in it. well this last tank i got 14.5 mpg:frustrated: i havent changed anything. no cel and i dont know where to start. any help would be appreciated
 

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Mine does 12 to 13. :laugh: Everything else seems good, so I'm changing my computer.
 

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Watch that peddle work! :hihi:
 
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maybe be due for a tuneup also clean your MAF

possible 02 sensor .....

pull codes then you will know
 
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