Actually I didn't test them, I let Craig test them after hours on his own time, but I saw the results : )
Want to save money on fuel? Here are my suggestions.
Get the least restrictive air filter possible.
Get rid of the pollution control crap.
Do everything you can to make the airflow going in and out of the engine as least restrictive as possible.
Make certain that your compression is good and that all of your plugs and ignition system is working properly.
Advance the timing as far forward as you can without it pinging, knock sensors are mandatory (chip it).
Buy the highest octane recommended for the engine.
Buy your fuel when it is cold and drive when it is warm : )
Find the sweet spot in the RPM range, generally in the 2800 to 3200 rpm range and try to give the engine the minimum amount of gas to maintain that rpm. : )
Depending on what you have been doing with your engine that might give you up to a 10 - 20 performance and fuel economy boost. If you can follow the last bit of advice you might get a whole lot better than 20% : )
Good suggestions.
I have a question on the timing advance. Old Honda CRXs get 50 mpg, but comparable newer cars don’t even approach this figure. Is this because of retardation of the timing to achieve emission standards?
As for the knock sensor, that can be overcome with a flashed prom or different chip?
In the end, I still can’t help but suspect that a little HHO would cause a more efficient burn. The trick is getting the rest of the car’s programming to utilize it properly. Probably why most of these homemade units are being installed on older carbed cars.