Just did my first MPG test, I can get (conservatively) 160mpg on this setup. I put 8 ounces in the tank after running it dry and did 12 miles before it ran dry again. Speed between 30-35, about 65% in 4th gear, 30% in 5th, and the rest in 3rd. Terrain: undulating Virginia backroads. 2011 Felt Slater, Honda GXH50 4-stroke with cam, Sturmey-Archer 5 speed hub.