I have now ridden my Bandit to work 2 days this week, 30 miles each way, and I am really pleased with the gas mileage, I'm getting 35 mpg. I have the 1246, 13 to 1 JE piston kit with oversized valves and the cammotion G21 cams. I don't believe that it got more than 38 mpg stock.
I am still running a little rich, so I may go down some on the main jets.