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Discussion Starter · #1 ·
Ok. I just put new plugs in my jeep and it went from I think it was 12.5 mpg on the dash down to 8 mpg.. Lol...what gives? HELP!!
 

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Dont trust the dash gauge, after only a few short miles it's not going to tell you anything correct. Its very likely that your actual mileage didnt change at all.

The best way to know your mileage is to reset the trip counter every fillup. Divide miles driven by the amount of gallons you put in.
 
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