I have a 2013 JKU and need new tires. The spare has never been used. Date code for tires is 3812, or mid-September 2012. Car is always garaged, so spare tire has had minimal exposure to sun. My understanding is that the spare has TPMS.
1. get four new tires or
2. just get three, use the spare as a primary, and use the best remaining tire as the spare?