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Old 11-20-2012, 12:51 PM   #13 (permalink)
Sven7
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Join Date: Aug 2011
Location: Warren, MI
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Boo Radley - '65 Ford F100
90 day: 13.28 mpg (US)
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EPA didn't test cars before 1984 so yeah, the estimates will be off. I divide 300 (the normal range for a car) by the tank size in gallons to figure out the manufacturer's approximate MPG estimate.

My 1965 truck has a ~20 gallon tank, so that would peg it at ~15mpg, which is correct.
My Rabbit has a 10.5 gallon tank which would put it at ~29mpg, about right on 87 octane.
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