My RS Vector ER only has 115 miles on it so it's still nice and tight, but got right about 17 mpg on the first half tank. I'm hearing from other forums that 20-21 is possible from broken in machines.
Primary Sled: Yamaha RS Venture, and Polaris 600 Edge touring
Where I sled: Labrador
I had my dad's RS venture out today and had $20 of gas put in it last week, but gas up here cost like .96/L but yeah I put around 130km on it and just under half a tank now so it's showing good and its not even broke in yet so it may even get better.