first i want too say i hope these new forums will be a welcome addition to a great site, and there will be no bashing. we are SNOWMOBILERS first, no matter what we choose to ride. i have been fortunate to have met with and ride with both rob and jane, and they seem to be good people. i put 10,003 miles on a RX1 this season, this is a fantastic sled. i had no problems, i replaced 1 belt, 2 inside rear idler wheels, 1 set of plugs, 3 pairs of carbides. it uses approx. 1 qt. of oil every 1000- 1200 miles( i believe when riding at high rpm's it is pulling oil from the crank case through the breather tube up into the airbox and into carbs and burning it.) original sliders have 1/8" left. fuel milage depends on how it is ridden and conditions, i saw as low as 14mpg and as high as 20mpg, with a consistant average of approx. 16mpg- 17mpg. suspension set up is the key to getting a good ride from the pro-action suspension. the motor is so smooth, this sled is a genuine joy too spend time on. it has been a fantastic season on a fantastic sled, looking forward to next season. be well,fred.