[Pierre]

Of course there's a spare! It's under the rear floor board. It's not a full-size, though: it's one of those temporary, "doughnut-style" things, although some posters have found a way to get a full-size in there.

 

[Pierre]

OK, OK, so it's under the cargo area... that's close enough to the rear floor board for me...... especially if you consider it the 3rd row seat floor board!!!!!

 

[Pierre]

But, I suspect that, since the rim is a regular rim, when it is time to replace tires, you can keep one of the old, regular tire as spare.

I don't think it's a regular rim. Otherwise, Acura would have put a regular-size tire on it, no?