Hi All, I have a 2015 90D with 19 inch rims and air suspension and has about 25,000 miles on it. (I drive about 22k/year). I don't drive very aggresivley and I live in Southern California. I plan on keeping my car long term. My car came stock with the Michelin Primacy MXM4 and in the last week I had two nails removed from two of the tires and repaired but there is also a large gash in one tire that is not repairable (and tire store said it won't last more than another month). My current tires don't have a lot of wear on them at all but I am thinking I might have to switch out all 4. So my 2 questions: - Do I have to replace all 4 tires or can I just replace the one that is not repairable? - My options are Michelin MXM4 $1200-$1300; Michelin A/S 3+ $1100-$ 1200; Goodyear Eagle RSA2 $650-$700 Any suggestions would be appreciated.