Very cool thought and I agree that using high energy density compounds is a hard habit to break. I'm not sure it's one that will need to be broken, as you point

Very cool thought and I agree that using high energy density compounds is a hard habit to break. I'm not sure it's one that will need to be broken, as you point out. If there are "synthetic" ways to create such fuel, I think plenty of R&D is underway and we'll hear about them as they develop. I'm pretty sure the initial excitement has worn off but I'm hoping that aglae-based fuels can eventually be competitive as well.