I have literally bought mu KTM DUKE II 640 and im really happy with it. I bought it some 150 miles from where i live, on my way home i ran out of fuel but switched my reserve on and was able to get to a fuel station. I checked the mileage and as i kept on going home i wnet to fill again so i didnt run out again, but this time it only took half a tank! So how far should i get on one tank of fuel please?!?