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The gallon is a constant.
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Just be aware that the Imperial gallon is 0.8326716 of a real gallon.
I'm skeptical of the origin story. If today's mileage were available then we might be talking about miles per quart. It might have been available in gallon tins, but generally it was hand pumped into an elevated (graduated) sight-glass and then drained into the car by gravity.
In the one-time Republic of South Vietnam, they sold gas from roadside stands in American whisky bottles.