I think they had stuff all the way up to 95% H2O2. Back in the 80's, he had gotten a call from someone that was w/ some F1 team, asking about possibly using H2O2 in racing fuel. Talk about scarry!!![/b]
Bill:

They were using this stuff for super high altitude planes weren't they? I didn't think H2O2 was particularly nasty outside of being a terrific skin remover. I know its pretty unstable so it wants to give off its extra O and become water.

I'm guessing because it turns into water it doesn't work well to mix w/ fuel for an enhancer?