I use the My Cars app on Android, on my phone until last week, and now on the tablet I've been using and am in the process of building into my car. It doesn't do average mph (since it has no way to know the hours that I drive), but it does do average mpg (well, L/100km for me).
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Stefan Vorkoetter: Programmer, hobbyist, amateur watchmaker, pilot, and collector of fountain pens, slide rules, calculators, and watches.
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