I'm just reading up about replacement tires for a 2003 Prius. Not wanting to get into fussing with tire pressure with non-standard tires, I basically choosing between the two OEM tires, the Bridgestone Potenza RE92 and the Dunlop SP10. I noticed the Dunlops get a "B" temperature rating, compared to an "A" for the Bridgestones. Should I be concerned about this? I am in an area that gets a fair amount of hot (over 90 degree) weather. Could the lower temperature rating be an issue for driving on the freeway on hot days? That aside, I also read in another couple year old thread someone saying the Dunlops have been discontinued, although I still see them for sale at Tire Rack. Should I assume any Dunlops for sale have been sitting on the shelf for a long time? Thanks for any help.