I drive a lot of mountain roads in wet and dry. For best performance, milage and tire wear on my '06 Prius I check the tire pressure (I run 35psi) and get tires with the higest hardness rating. Dealers like to talk all kinds of "features" but I am not looking for high speed cornering, super soft rides or the ability to float down a river and not lose traction (if the warer is deep, slow down !!!). Ask for a comparison of hardness rating, I normally get 35 to 40K miles over some pretty nasty mountain roads with the highest hardness rating the dealer has available.