Grump,
Please don't tell me you're shootin' for the Iron Butt award. I suggest an old guy like yourself stop and refuel frequently unless you've got Depends to go with your extra fuel. Hey, maybe 2 cup holders rivoted to your helmet and some 1/4" tubing like those beer can beach hats. Two sixteen ouncers ought to get you a few extra miles between stops. I can just picture you scootin' down the road like a human Molitov (sp)cocktail.
Barry