here is a test btw
http://www.tirerack.com/tires/tests/....jsp?&ttid=103
RWD BMW with winter tires was better in all tests vs AWD Cayenne with AS tires..... acceleration was the same, kinda proves that AWD with AS tires is useless. PS. I dont doubt that it can climb the hills better, thats where AWD would have an edge even with AS