Richard, both my Benz's have Michelin tires and the cars manual and door stickers on both say 32 PSI..max
Keep in mind the PSI on the car door is from the car manufacturer NOT the TIRE COMPANY... The car company also wants a nice comfy and quite ride..
Remember a few years back when all the Ford Explorers got bad press for rollovers due to tire failure,, that was Fords tire pressure at 32psi,,, at 40psi those tires would not have reacted the same way,,, so I always go by what the TIRE says not the sticker on the car door.
Most performance street legal tires like that will work great at 80 to 90 % of the tires max PSI.. I never run 28/32 like my car sticker says,,, I run 40 year round...
and for High speed driving I would bump to 45psi (just stay at or under the tires max psi)
Have fun and be safe
Charles