75% is a big waste of fuel if you’re trying to cross an ocean. Maximum range is achieved at Vg. I’m told maximum endurance can be had at 76% of Vg, though I hav

75% is a big waste of fuel if you’re trying to cross an ocean. Maximum range is achieved at Vg. I’m told maximum endurance can be had at 76% of Vg, though I haven’t checked the math on that myself so don’t quote me on it. :) There’s another optimum at the reciprocal, Vg * 1.316, that gets you maximum speed per unit of fuel burned.