I'll poke around and see what I can find, but I think you'd be surprised.
Some guys will only toss the spare in for road trips. Traveling locally, they just keep a plug kit and compressor in the car.
I'd say most people don't bother with the spare. Probably a combination of complete blowouts being rare, and the fact that many would simply prefer to call for a tow vs. change their tire on the side of the road.
Is it worth raising the floor vs. just leaving the tire in the rear laying down flat in some kind of bag?
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs)
'14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat)
'08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat)
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