For some years I've been in the habit of carrying an air compressor and tire plugs in my cars. It is my experience that at least 50% of punctures can be patched in place providing a faster and, depending on the situation, safer means of getting back on the road than installing a spare. The tire can then be dismounted and a more permanent repair made at a convenient time. However I am concerned that the inexpensive 12v air compressors I have (there's one in each car so I don't want to pay for really good ones), now several years old, may not prove reliable in the hour of need. Wondering whether anyone has figured out a system that works for them, whether with a 12v compressor, a manual pump, or CO2?