A gallon of gas is 3.785 L in the US. In the rest of the British Empire it was 4.546 L. It definitely was not easier back when both gallons were in common use.

A gallon of gas is 3.785 L in the US. In the rest of the British Empire it was 4.546 L. It definitely was not easier back when both gallons were in common use. And by "pint of beer", do you mean an Imperial pint (568 mL) or a US liquid pint (473 mL)?