Random PSA: If you own a motor vehicle that has a spare tire, it's a good idea to check every once in a while that the spare actually has air in it enough to support the car. Had to get the spare out from under my truck (a hugely complicated maneuver that would be really unfun to do for the first time in an emergency), and found it had about 10 percent of the necessary air.
If you can't be bothered to check the pressure once a year or so, better keep an air pump in the trunk as well.
