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your car is full probably 5% of a time, airlines have profits from full planes, you don't.

"per gallon per passenger" is a useful measure for planes.

If you’re running an airline, yes that’s the relevant metric. If you’re comparing an urban elite with a poor bloke with his truck, no.

Mr. Loves-his-truck drives, at the insane most, 20 000 miles a year. That’s a round trip Thai vacation.