Another cool idea (for way future) could be a calculator... It already has the fuel per mile. But what if, judging by your previous MPG and an input of number of miles, the app could say how much gas money it would cost--i.e. "it would cost you $14 to drive 300 miles." (I suppose price could be an optional input...or you could use the price of the last fillup for car X)
You could even (for way way way in the future) somehow integrate with GMaps so you can ask it "how much will it cost to drive to nyc?"
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