x2 on what joe said.
Goodyear run flats suck ass, stiff ride, tough side walls. some people say the good year run flats are good enough for winters driving- i actually beg to differ. more often than not i hated the tires in snow/sleet/winter. especially the slip and bounce when merging on highways, especially if you go over the road slick markers. i drove my one of my friends 5.7 with winter tires in the same places i drove my SRT and WOW what a difference.
sort of useless info, sorry