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by u801e 2188 days ago
With volume per distance, you just need to divide the fuel tank capacity by the volume and then multiply it by the distance to get that. With distance per volume, you have to multiply the distance by the total volume of the fuel tank. The first calculation isn't that much harder than the second.

Realistically though, once you've driven the vehicle for a while, you pretty much know the total distance it will get in a tank regardless of the way fuel usage is measured.