not just your opinion, some people down under also believe it is feasible and are experimenting with their carbed, efi'ed, or turbo-ed diesels and getting results.
as far as they are concerned, its not a scam since they got the information freely on the net, through materials from some companies, forums etc etc and putting the relevant or working bits together in creating their own water4gas systems. and from their experiences, i gather that its not unlike the LPG setups for diesel engines, the water4gas producing enough HHO to replace SOME of the gasoline needed to fuel the combustion. and since the HHO is produced and not purchased, that is where the savings come from. with the LPG'ed diesel, the cheaper LPG contributes to the savings.
producing the HHO also doesn't put more load on the alternator, since the electrolyzer consumes the same energy as an ordinary headlight.
again, this is what i gather from reading their forums, no first hand info YET... let me just find enough time to build me an electrolyzer and upload a video of me exploding an HHO-filled balloon
and please let us keep this thread informative... arguments are welcome provided they have serious points of rebuttal, like ghosthunter's and others. honestly seeing someone's lenghty posts here always filled with hydrogen sulfide gives me a headache.:peace: