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I started messing with the equation to help myself wrap my head around it. We, who use MPG, would like to think a 100 mile trip at 50mpg and a 100 mile trip at 100mpg would net you a 75mpg average. But that is averaging the MILES not the gallons. It should be an average of a 100 mile trip that used 2 gallons and 100 mile trip that used 1 gallon. Which nets a 200 mile trip with 3 gallons used, or 66mpg. Thanks Three wheeler, now I am really going to be upset about bad tanks.
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