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Why would I be interested in US gallons?
For comparison of "gas mileage" of North American vehicles with European ones, since I was taking about mpg. If you use SI units, the different gallons are obviously irrelevant, but it's still not easy to compare manufacturers numbers due to different test cycles and regulations on claims. FWIW the basic (120hp) Canadian Ford Fiesta does 7.9l.100km-1 using the Government of Canada approved test method for combined cycle, where the Euro (125PS) one does 5.7-6.1l.100km-1 depending on which version, on the WLTP combined cycle.
Why would I be interested in US gallons?