HEY EVERYONE!

My tank of gas (only exhaust and airbox mod) lasts a weekend of hard riding, 3-4 hours a day, times 2.

You either ride really easy or stop and shut off your bike a lot. Your saying you can get 6-8 hours on a tank of gas? No offense but that seems like a lot.
 
I run premium 92 octane. I ride fairly hard (wheelies and jumps, speed around and ride trails.) I shut it off when I am stopped and talking or bored, but that's it.