No input on turbo, but track length: Last two years I have had a 146 FR and a 165 Expert. Last year mileage was 901 on FR and 260 on 165. This year so far, mileage on FR is 850 and 165 50. Next year will be 146 FR and 154 Expert. I am not a fan of the 22 165 Expert, but have not gotten to use it where it is intended. Hence the 50 miles and our ****TYSHITTYSHITTY snow year. The one time I rode it, it handles strange in my opinion. But I have been used to a 146. Tater and I just got back from a 50 mile after school rip, was SUPER glad that we both had 2.5 146 sleds. Couldn't keep them cool. Would LOVE to have a deep day or two to actually see how mountain sleds are supposed to work. Instead of trail rides.