What is the meaning of "what you have in water" in the following sentence,
Burn something and - whether it's melted or not - you have changed its chemical character, because it become bound to an oxidant (often oxygen -- ooh, what a coincidence!?! -- but not always e.g. you can burn sodium in gaseous chlorine to make salt) and released energy, so you will never get back your starting material without putting back into the system more energy than it gave up in burning.
And that's why we'll never have water-powered cars - you can't burn hydrogen any more than what you have in water. Water is hydrogen ash.
source: Mick Wilson's writing in https://www.quora.com/What-is-the-difference-between-melting-and-burning
Does "You can't burn hydrogen any more than what you have in water" mean "You can't burn hydrogen any more than hydrogen in water" ?