Had a blowout close to nowhere. Spare was good, slightly underinflated at 50psi, the other tire was at 65psi. The only place with a tire that, fortunately, was the same brand only had an E rated tire; my others are D rated. Put the new tire in the spare position.
D rated tires recommend 65psi while E rated tires recommend inflation to 80psi. So right now I am running on tires inflated to 65psi with a spare filled to 80psi. My question is when the time comes and I have to use the spare, will the additional 20psi on one side make any difference? Should I deflate the E rated tire to 65psi to match the others? Can I do so safely or would it be basically running the tire underinflated thus promoting more wear?
Thanks for any input.