Hydrogen Injection Thumbs Up from the U. S. DOT

Dont' want to read the whole report - no problem. It primarily focuses on safety of H2 systems and contains no new information. There is exactly 1 paragraph that deals with burning H2 (or HHO as the snake oil salesmen like to call it):

A hydrogen injection system for a diesel engine produces small amounts of hydrogen and
oxygen on demand by electrolyzing water carried onboard the vehicle. The electricity required is
supplied by the engine’s alternator or 12/24-volt electrical system (see Section 1.5 for a
description of electrolysis). The hydrogen and oxygen are injected into the engine’s air intake
manifold, where they mix with the intake air. In theory, the combustion properties of the
hydrogen result in more complete combustion of diesel fuel in the engine, reducing tailpipe
emissions and improving fuel economy (CHEC, n.d.). Limited laboratory testing of a hydrogen
injection system installed on an older diesel truck engine operated at a series of constant speeds
showed a 4 percent reduction in fuel use and a 7 percent reduction in particulate emissions with
the system on (ETVC, 2005).

Let me summarized even the paragraph - under lab conditions in an unrealistic test unlike any real world conditions, using an inefficient, outdated diesel engine to skew the percentages as high as possible, a 4 percent reduction in fuel use and a 7 percent reduction in particulate emissions was found.

Your results will be FAR LESS than this. More like 1% at best. You will get more than than through proper tire inflation.

Still feel like shelling out hundreds or thousands on this scam?