Hmmm..., you guys are just talking about cruising and moving around. What do you think will happen when it comes to a battle. Some battles may take up some 10 minutes or so. Also a lot of afterburn will be used.
The idea of using h-fuel, is just not right. But if you are talking of carrying h-fuel like that, we then have to carry oxgen, water, food and many other commodities to make the game realistic. That would be a real nuisance!