I've been riding in temps down in the 30's, and my B12 absolutely loves this cold air. It takes a few extra minutes to warm up obviously, but once it's warm, vvrrrrrooooommmmm. If I just tickle the throttle she just about jumps out of her paint as it pulls forward. Now I'm not talking about hammering down, but any twist of the throttle at all the bike is so responsive, and chompin' on the bit for more. Definitely likes 30 degree air temp more than 70, 80, or 90. Too bad my riding time is about over, as weather here in the north country will make riding impossible very soon.