I was experiencing a lot of traction loss with the summer tires on my 1 in very cold but dry conditions. The snow tires definitely grip better in all cold weather scenarios (Blizzak LM-25s). My assumption would be that the summer tire would wear faster in the cold weather because you would experience more slippage which causes excess wear on the tire. I mean, you could take it easy on the throttle, but where's the fun in that?
2009 Alpine White 128i 6MT