Lots of cars no longer have spares. I bought a spare tire from modern spare that my wife and I share. They make them for several different cars. I usually only take it on out of town trips. When I'm local I use the Tesla tire exchange, which ive used 3 times. Ive had the spare tire for about 3 years and have never had to use it on either of our cars. This past weekend, I got 2 screws in my tire while in San Francisco. I just got the tire fixed before driving back to LA.