If you never reset the tripometer, the vehicle calculates the average mileage per gallon based on the total on the tripometer. After 400 miles or so on that tripometer, it is very hard to move it off the average that it is currently sitting
you have to reset the tripomenter to get a new average calculated. Can do it the old fashioned way, fill up the tank, count the miles from that point until you fill up again. divide the miles traveled with how many gallons you put back in the tank
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Capt. of the "No Worries"
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