I have done battle with a couple of tire shops over setting the pressure at the max on the sidewall rather than the recommended from the inflation table with accurate corner weights.
I have given up, if they won;t set them where I want them, I drive away and do it myself. I am on OEM Michelins date is xx11. I plan to have them inspected in 2016 and decide whether to go another 2 years based on the report. Last time around (prior coach) I replaced Goodyears with Michelins based on price. I got an estimate of the FMCA price and went to my Goodyear dealer and asked if he could come close. his response was "go back to Michelin". There was no fleet program he could fit me into. The difference on 19.5 inch tires was $100 per and that was three years ago.