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On my personal spreadsheet I added a formula to see is how much $ I saved vs driving an other vehicle. Basically it takes my mpg and estimated %city driving for the tank (and fuel cost per gal since it's a diesel and I compare to a gasser) and estimate how much fuel I would have used on a, say 24 mpg city / 35 mpg highway car to compute the savings. So that can be useful to track how much you are saving vs your other or past vehicles.
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