If I don't know the actual miles, I just omit the entry. I do this for the personal pleasure of good MPG numbers, the cost is already lower than I'd otherwise be paying had I kept driving the Mustang. If the cost thing is what you're really tracking, then yes, something like that would be useful.
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'97 Honda Civic DX Coupe 5MT - dead 2/23
'00 Echo - dead 2/17
'14 Chrysler Town + Country - My DD, for now
'67 Mustang Convertible - gone 1/17
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