This is 90% scam, 10% truth.
Brown's gas is a proven technology, but it doesn't do what these clowns say it does. It will generate about a 5% improvement in fuel effeciency in a gas engine, but less in a diesel. It does so by improving atomization, and by smothing flame travel in the combustion chamber. All of these things can be done better by other means at less cost.
This is a take-off on the operation run by George Watson in British Columbia. He also makes wild claims, but has failed to back them up at any of his demonstrations.
Anyone that claims more than a 5% gain from a Brown's generator is just plain lying. More improvement can be had, but only after expensive engine modifications, and those modifications will in most cases in the U.S. result in a vehicle that will not pass a smog test initial visual inspection.
Thank you for your additional comments.