I get 120 miles per tank; 40 miles per gallon. I have a windshield, saddlebags, and use ethanol in my gas, and have the standard 17/43 TBA sprockets. As well as the type of driving, it seems 4 things affect this:
1) engine/carb mods
2) wind resistance (windshield & saddlebags & speed)
3) gearing
4) ethanol