I am looking into an F5 for next year. I am looking for a sno-pro model. I am wondering what do they get for mileage, what kind of top speed do they get and what year is better and why? I know in 03 they came w/ 10 tooth drive wheels then got switched to 9 tooth drivers in 04. I think it was o5 when they got the ACT drive system (diamond drive). Just looking for as much input as possible. I want an f5 cause it is as close to a sno-pro 440 I can get with out it being a "race sled" I have learned over the years than I don't need anything bigger for the riding I do and i am pretty sure it will be just as fast as my current sled. Thanks.