Ernie FYI, I know it isn't for everybody, but Craig Vetter had some motorcycle efficiency contest back in the 80s, and one fella got his bike up to 470mpg, nothing mechanically fancy, mostly just fiberglass aero, gearing, and stroking, and technique. 62 miles on California hiways in real conditions.
1985 Fuel Economy Contest
So be kind to your two wheeled friends.