We all use regular old U.S. quarts.
Only politicians and the president can use Imperial quarts.....oh and the Queen of England.
Eh? Never heard anyone in the UK (and that includes little England) ever refer to quarts for a volumetric measure. Pints/gallons or litres.
That said, not really in the same social circles as old Liz!
the difference is compounded when you talk about Mpgs cuz they have Imperial miles too.
Ends up being a significant diff between US mpg and Imperial mpgs. Which explains why our Canadian friends tend to gloat about their diesel mileage more than they should, but of course, Canucks and Math, you know...
(I would hope that an imperial quart is still 1/4 of an imperial gallon, but who knows with those blokes...)