I recently purchased four new tires for my vehicles. I know that some car owners save at least one for emergencies as a spare. I didn't because we found a brand new tire in the compartment so there was no need to save even the best of the four. I just assumed the spare was a donut tire and didn't bother to look. Hindsight - I could have bought three new tires and used the spare and saved some money and kept the best of the four for the spare. Do you save the old tires from your vehicle(s)?