[coderenegade]

Yes. It's one of the reasons liquid hydrogen is potentially a better fuel than kerosene. You need a larger volume of fuel, but you carry less mass which makes cruise more efficient, and hydrogen burns so lean that you can fly around twice as high. You would cruise around 70k ft, instead of the usual 35k.

You do need more energy to go that high and fast, but it take a bit of analysis to figure out if it's problematic. Most likely it would be driven by the mission profile as to whether or not the trade-off is worth making.