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Originally Posted by SteveS
Many British imperial units remain in customary use in the US,
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No they aren't. The "Imperial System" was established in 1824 and the US Customary system wasn't in any way based on on it. The Department of Commerce maintains the Federal weights and measures standards and the individual States have their own copies of these. These standards were created and are maintained without any reference to the ones in London (which are no longer maintained).
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So it's fair to say that the customary units in the US are "Imperial, with US liquid units". But because the rest of the former British Empire has done away with the old Imperial units, it probably avoids confusion most to just call the units in customary US use "US units", even if they originated in the British Empire (again except for liquid units).
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There are other significant differences. US Customary does not use stones and the US ton is 240 lbs lighter than the Imperial ton was.