I read an article in Air and Space magazine awhile ago about a mechanic that specializes in the Merlin engines that are raced at Reno. The deck pressures that those engines are built to withstand are 145 inHg. That stuck in my mind because the RAM VI engines in the Chancellor I flew had a maximum takeoff power set at 45 inHg and I thought wow an extra 100 inches! There is nothing in MSFS that resembles realism except for pretty visuals.