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Hi....not really sure I understand the question, My scan guage is built in to the corolla. and like I said I have been reseting it alot...depending on if my wife has driven it or if I just want to see how a new route or trip does.
As far as calculating manually I just reset my trip meter whenever I fill up, normally within a few mile of when my low fuel light comes on, this consistently has allowed about 10.5 to 10.8 gallons fo fuel to be added...then I just devide.
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