It varies wildly, and saying you get 50 i assume means the best you've done? Because the difference between my best and worse depending on the type and hardness of my riding is about 8 MPG ! When mine was a 1600 i got 46 MPG at best. Now as a 1700 with mods and custom tune i only do a best of about 42, but it's one heck of a lot more fun to ride ! I'm also waiting on this last tank to see how i do now with mobil 1 V twin 20w50 in it because it runs quite noticeably stronger which means less friction and i think i will see a bit better mileage, probably a couple MPG. But i could be wrong....we'll see.