> Military use involves completely different economics, but for related reasons the anticipated greater fuel efficiency is rarely a big deal for the military.

> Military use involves completely different economics, but for related reasons the anticipated greater fuel efficiency is rarely a big deal for the military. Utterly false. Greater fuel efficiency means greater range or less fuel needed for the same range and payload, and you'd better believe that is not nothing to military planners. I can say that because I used to be one. Every drop of fuel burned in theater in a war has to get there somehow. And until it's loaded on a jet and used, it's vulnerable to being targeted either in transit or at rest, and has to be protected. And pre-war, the more gas you're going to burn to accomplish a given task, the more facilities and infrastructure have to be in place at your potential bases to hold it, meaning more access agreements with foreign countries and/or construction contracts having to be paid for in those countries to build said facilities. And you have less ability to use smaller or more austere facilities, limiting your ability to disperse the force and complicate enemy targeting.