don't worry about it, if you like the car then keep it, ask the dealer what they charge for brakes, oil changes etc... and maybe you prefer a independent shop who can do it for much less. then theres random stuff that brakes and they will break. look at your service records and you will get an idea of whats been done an how often you need maintenance. also theres a extended warrentys that you can buy that gives ya 2 more years.

a tire shop can mount what ever tire brand you want doesnt have to be run flat
an dealers dont know anything about working on cars you see grease on his hands or a suit and tie
higher the car price
higher the up keep
maintenance can be done at any shop pretty much cheaper than going to dealership
thats in busniess to sale cars
where auto repair shops in business to repair and maintain

and sensor work by pressure not by what type of tire

ask any tire shop for a good tire

some one like myself stop listening to what dealers says
working for the money sure hes going to tel you what you cant do since he gets his tires from me at tire shop he can charge you double go to a tire shop ask