My Nitto NT555R tires have worn out and I'm thinking about going with MT ET Street SS tires or ET Street R tires. I have a couple questions 1. Does anybody have any input on how long either of them last mileage wise? 2. I drive the car on the street 90% of the time, so which tire would be better for me? I take my car to the track once in a while and do highway pulls as well.