Quite a few new cars are shipping either with an emergency repair kit or nothing at all, versus even a compact spare.
Some products work fairly well, but I don't know if those tires are then patchable and repairable after the fact. I suppose it could throw balance off, if the foam settles all on one side of the tire.
Honestly, I don't carry a spare anymore - they never get used and they rot out. I pay for a towing package through my insurance, so if the need arises, I just pick up the phone.
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