Throw an add on fuel tank onto a rear rack. Nomad makes them. Not sure if you need to be a member to see this, but I'll post it anyway.
2013 KTM 690 Duke w/ performance cam, airbox, and Akrapovic full system. 300lbs and 74.5rwhp
2011 KTM 250XC with lots of protection stuff for when I bounce it down a hill.