ihatejoefitz
In the link you provided to debunk:
http://www.aardvark.co.nz/hho_scam2.shtml
it says:
"Yes, the addition of H2 and O2 the intake of an engine does appear to improve the thermal efficiency by (in the case of the tests cited) an astonishing 15%."
There are a lot of BUTs circling that, but still. Thanks for the link!