you can get good distance doos to win the sprint racing but no sprinter will win the distance race into a head wind at 500ml i have been fortunet to have doos that can win from 50ml to 575ml but if you feed light for the early races say on round about thay whant come back on for the distant races so be verey carefule you have to set your stol out for what races you think are more inportent for you and get a routen that suets you and stick to it doos love rutein so i have been told 8) 8) 8) 8)