This probably doesn't impact that many people, but on a motorcycle with no fuel gauge, you use the odometer as your fuel gauge. You need to know how many miles to reserve, and how many miles to empty. So I regularly monitor how many miles to go from a full tank to reserve. While quantity per distance may be an easier metric at purchase time, that only happens once every few years. Distance per quantity is a calculation I do in my head several times a week to ensure that my vehicle maintains a good state of tune.
If you're using the odometer as a fuel gauge, surely volume becomes irrelevant for judging your range (excluding the tuning purposes)?
e.g.
My tank lasts 200 miles => I've gone 100 miles => I can go another 100 (top) before refilling.
