I daily drive my E90 M3. I have had several flat tires, near my home as well as on long road trips.
I would never use the mobility kit (messy, ruin the tire) and I hate waiting for a tow service. I'd rather get back on the road. So, I carry a space saver spare and change kit with me everywhere I go, it doesn't take up a lot of room and it can fit all corners. The peace of mind is reassuring.
Also, I have USAA, and in some areas they are not allowed to send a tow truck, any road side situation has to be handled by the municipality.
https://drive.google.com/file/d/1_5P...ew?usp=sharing