J. Clarke and I (Mark Brader) wrote:

Apparently for some reason known only to the Canadian
legislature, a Canadian citizen can't drive across the US-Canada
border in a US-registered rental car ...

That's wrong -- as correctly stated elsewhere in the thread, the
rule applies to Canadian residents, not citizens. It's a customs issue.

It's only "wrong" if it doesn't apply to citizens.

Right. Immigration cares about citizenship; Customs doesn't.
--
Mark Brader, Toronto | "Whatever you are, be out and out,
| not divided or in doubt." -- Brand (Ibsen)