thanks Bob. I have an extra fuel cell so I will run skidoo dry and see how the guage works out. Reading the threads and sounds like this fuel guage reading is a common issue with ski doo.The fuel gauge will show tanks full for 30+ miles and then slowly move toward empty and show empty along time before fuel light comes on. With fuel light on, you can go easily another 20 miles. I gotten as much as 140 miles with my Modded 900 N.A. Ace. They all do it, why, I do not know, but every sled I have owned has an inaccurate fuel gauge.