So just because im kind of a "whats best" as far my car goes. So I joined costco and if they install the rubber its free rotate and ballance for life of tire and free nitro fillup/checks. They only use nitro. As far as people saying they notice less pressure drops from nitro... i have to say in my experience it has always been 1,condition of rim 2, expertise of installer 3, age of rubber. Damaged/bent rim u need to check often. Poor install will cause issues and last old tires are well "tired"
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