thx for the comment richard. your comment was helpful. yes i've noticed most of the hho stuff now is kits on ebay and instructions how to mod your car's intake to accept a little bit of HHO gas, calling it a hybrid. but i am personally excited about getting "off the grid" so to speak. even if i had to pedal a bike to generate the wattage, or setup a large solar panel array, or both, in order to charge the battery or produce the gas or whatever--to me that is success. i am looking for self-reliant solutions using HHO for transport, cooking, generators, etc. thats why i ask about 100% gas cars.

http://www.hydrofuelsys.com/  has a HHO cell that has separate hydrogen and oxygen outputs so you do not have to use the oxygen just hydrogen. They claim the computer or ECU does not have to be corrected. I have just ordered this system from Bill Corless..