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I don't know the math but I do know that it always is a little low when compared to actual use when calc'd at the fillup. Heaven forbid I should forget to enter the new tank when filling up. It will take 2 tanks to get it straightened out. I really just use it as a yardstick to hunt for the highest numbers, mpg, while driving which in the end give me the best mpg when calc'd per tank. It has worked so far for someone who is tech challenged.
homeworkhome53
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