I was having a conversation with a fellow rider the other day about the loss of mileage during the Winter months. Being a former auto technician I could conclude that a certain amount of loss could be attributed to the cooler weather due to a less than efficient engine operating temp. Especially on air cooled engines. So I thought I'd post here and see what others might have to say and to see if others have experienced the same. I seem to be able to maintain in the lower 40 mpg currently however I have gotten the bike to tell me 52 in the middle of Summer. I'm in Colorado and have been riding in 20 - 40 degree temperatures.