Just an afterthought: if this can be done with the fuel logs, I like Testdrive's idea of using gallons per 1000 miles rather than per 100 miles, since it would generally result in a double digit number, like MPG, and would make the transition easier. And the extra tenth could be added to allow for more accuracy. I think 28.4G/1000M has more of an impact than 2.8G/100M, even though the latter is more in line with practical units of measure.
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