That's not a bad idea. We've been reluctant to do much with pricing since we currently just support US dollars (we're working on other currencies), and also because fuel prices are very much up and down right now it's tough to link driving habits with costs.
At the beginning of the summer, I was paying well over $4/gallon of fuel, but now it's over 50 cents cheaper, but my fuel economy could be worse and I'd still be saving money due to the changing gas prices.
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