Your new car likely comes
Your new car likely comes with roadside assistance. Most auto policies also offer roadside assist and towing coverage for a very small additional premium. In a small car like our Cooper S, there is really no room for a spare anyway. Of course the OEM tires are runflats. Once they have some miles on them, I would be inclined to install normal tires and just rely on a tow if we get a flat. Just about any repair shop can patch a tire that has not been badly damaged, and if the tire cannot be repaired, a replacement won't incur the runflat premium. I have a real spare in my 20 year old M3. It hasn't been used in the 20 years I have owned the car.