Looks like I'm not the only one, I just use the trip meter and divide by the gallons at the pump. It's not perfectly scientific or accurate, I'm sure, but it is at least consistent.
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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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