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4-decimal-place Cost Per Mile?
I'd like to suggest reporting cost per mile to more decimal places.
In my personal spreadsheet, I have cost per mile set up to display to four decimal places, e.g. $0.0821. Having this figure reported to more decimal places allows me to recognize up or down trends much better than if it were simply reported to two decimal places (e.g. $0.08, as Fuelly does now on the Profile page). Consider that Fuelly's present rounding logic treats both $0.0750/mile and $0.0849/mile as the same figure...$0.08/mile. Yet there is a 13.2% difference, or $13.20 per $100 spent, between the former and the latter!
This would also help drivers better estimate annual fuel costs. A cost per mile figure given to four decimal places allows for an estimate of the fuel cost to drive 10,000 miles down to the nearest dollar (e.g. $0.0821/mile * 10,000 miles/year = $821/year). With Fuelly's current model, I can really only estimate 10,000-mile-cost to the nearest hundred dollars. If I drive say 30,000 miles a year, or if I am considering purchasing a new car and want to estimate fuel costs over multiple years, the difference between having a 2-place cost per mile and a 4-place cost per mile becomes even more amplified.
If Fuelly were to implement a 4-place cost per mile, I'd suggest reporting it as x.xx cents/mile, rather than $0.0xxx per mile (e.g. 8.21c/mile rather than $0.0821/mile).
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