I drive an 06 RS Nytro that has been stretched to a 144 so I thought that this would be the best place to ask about gas mileage. When my sled began life as a 121, I would average 18-20 MPG Canadian on the trail. Now, as a 144 and mountain skis, I'm seeing 15-16 MPG. Is this about what the RS mountain sleds are getting or should I be looking for a problem affecting gas mileage?