Do you have them just on the rear......or all 4 ? I don't seem to be able to get more than 25 or 30 k miles out of any tire......so $105 seems SO CHEAP!!! New OEM Contis are like $250 each.....so what if I only get 20K miles out of them!!! Surely even in the winter you have many days where you drive like a maniac....how do they handle when you drive like that???