We got our HH about a month ago, and we're loving it. But a friend asked me a question the other day I couldn't answer. I was telling him that it was a SULEV, and he asked how the emissions could be so much lower than a conventional vehicle getting <30 mpg. I know that part of it is that the gas engine doesn't have to work as hard because the electric motor gets it moving, but it doesn't seem like that could be a huge difference. Anyone know a more complete answer? Thanks!