I own an 02 r1150r that I have had since 2010. She had 21k on her when I bought her and now has 38k. Other than the clutch slave cylinder going last fall (proud to say I did this myself and hope to never have to do it again), I have been very pleased with her. I do all my own maintenance. I am not an expert but have been able to do everything so far with the help of online aids and other resources. I just recently did my 36k maintenance and everything went well. Bike ran great afterwards. I do not experience any surging. Runs smooth as can be. I just recently removed my tank to connect a heatroller to my battery and now my gas mileage has dropped significantly. My low fuel light would normally come on at 135miles and is now coming on at 121 miles. My commute is exactly the same. Nothing has changed except the temperature. I am racking my brains trying to figure out what has changed and why my mileage has dropped so significantly but nothing is coming to mind. If my intake valves were slightly off would this be the cause? I would appreciate any input at all.