In another piece of "are you serious?" news, one of the best rocket fuels in existence is...WATER. Think about it, extremely stable, but when broken apart become two of the more reactive and energetic molecules in the periodic table, Hydrogen and Oxygen. Hold up, isn't that what we use for rocket fuel currently? Getthefuckoutthere, I can go to the pool and take a dip in fucking rocket fuel? Goddamn I love science!
So, any moon or asteroid that has ice essentially becomes a fucking gas station in space. The ultimate in hyper-miling would be to slide in behind a comet and catch the bits of ice that tear off of it to convert to fuel. In flight refueling.
If humanity made up it's mind to do these things, they would get done, and quickly. We're already almost there, and we've just kinda been dicking around with space for the past 20 years. Come on, EARTH. Get your shit together.