After giving up on running in the cold (single digits to below zero by 20 degrees for several weeks), I broke down and got a bike trainer - Cycleops2 fluid trainer. I am in the 'frozen tundra', and my cutoff is about 45F.
After being on the trainer for several weeks, I am wondering how many people call 'trainer miles' into their annual mileage total. That would definitely help my annuals, but don't know if this is the 'ethical' thing to do. After all, the fluid trainer is supposed to be very close to the feel of the road for energy expenditure. Or do you only count the 'road or off-road miles' and not trainer miles.