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Old 01-23-2012, 02:15 PM   #8 (permalink)
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You could also drive until the reserve light comes on solidly, then always fill up ASAP with the same volume of fuel.

You won't have a tank average, but you can monitor your miles-to-reserve-on-X-gallons and try to better that number.

You can make it more accurate of keeping track of how many miles you do before filling up, and adding them to the next miles-to-reserve.

That said, the weight savings of half a tank won't matter very much when there's 3 people and their luggage in the car.
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