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I use an Excel spreadsheet shared between my phone and my PC. You could create a different sheet for each vehicle and customize it to use the data you want (ODO or trip) and show the results you want. I enter the date, ODO and gallons then calculate tank MPG, 5 tank MPG and total MPG over life of the car. Works really nice. You could also track maintenance, etc. Just add columns and formulas to your heart's content.
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