[MoCoNative]

I will throw this in, my 84 FJ-60 has 221000 miles, compression in the 115 range, with a low #6 cylinder. Bones tock running gear, etc... On the same stretch of highway that Powderhound references getting 15 MPG, I regularly get that also. It is not the best stretch of highway of fuel economy that is for sure, so he did well. But for my daily drive to work my 60 gets 14-15 MPG every day, week after week. It is tired and not at optimal effecincy, however, I rebuilt the carb several years ago, keep the cooling system properly maintianed, tires inflated, timed correctly, plugs good etc...

A 60 should get 14-15 all the time. For 400 bucks, I could do a lot of tuning to keep the normal mileage. On my best trips, I sometimes got 17MPG. I also have a good complete emission system, which probably helps. But I don't think the system is the total reason the rig is doing better, and it you are not accomplsihing anything more than what that engine should do.

I do believe that these HHO systems may help an engine, in some way. I am tempted to try one on my 40. I thought the High Altitude Control ports in the top of the carb would be a good spot to inject the hydrogen directly into the air and fuel stream of the main venturis. But, to get a cell large enough to actually produce enough gas for the engine displacement will take far too much power, electrically than you will get back. To run a cell large enough for an F series engine would take about 30 amps. Stock alternators on cruisers are waht 35-55 amps, depending on vintage. Great, you can run your HHO cell, don't count on running your headlights, heater blowers, radio, oh and the ignition and charging circuits.

I suspect a person would have to run a second alternator, and then subsidize the generator with a solar panel on the roof to ever see a free benefit from the gas produced from the generator.