The site says these devices are a combination of water injection and HHO generators. I have read that people see gains in economy using HHO. I have also read 5x that amount of people who have never actually tried it and just dismiss any possible benefits.

I built a hydrogen generator and I can tell you that the HHO that it produces contains a lot of power. If you light one 1/2" size bubble with a lighter, it sounds like a .22LR round going off. My ears were literally ringing! I can see how HHO can be a combustion catalyst.

I believe the key is to make an efficient hydrogen generator. One that consumes low amperage but has a high yield. I have been researching this stuff for months now and I have some theories I want to test on my generator.