I'll politely disagree. Spares are/were underneath pickup trucks, hangs off the back of wifeys RAV4. Then a Crovette and other sports cars would need 2 different size spares so space is a factor in some cases.
Recon which costs more?, a spare wheel and tire or the air pressure motor system? Mfgrs don't give a hoot about cost. The consumer covers the cost.
