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Does anyone know how many miles the computer keeps in the memory when calculating the average mpg?

The reason I ask is once a month I do a road trip that's more than 1000 miles. The car gets better than 28 mpg on the trip but the read out never gets up past 24 mpg. That must mean it's averaging more than the last 1000 miles.
 

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I am not positive, but I am pretty sure it keeps track from the time you reset it.
 

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The mileage display keeps the average over the number of miles since the last time you reset it. The miles to empty keeps a 500 mile average to calculate how far you can go on a tank.
 
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