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One of these things can be built for about a hundred bucks. I’d like to see one dyno tested and put on a five-gas analyzer too.

I have a new Jeep and an 06 Mustang GT, and I dont’ want to risk either one. I need an older car to try this with. I understand you’re supposed to advance the timing and mod the O2 sensor to make it work correctly.

I have tested about 5 of these kinds of devices on a dyno. The bottom line is that there is no perceptible difference with the device operating or disconnected. They simply don't produce enough gas to be noticeable. They don't even put a drain on the alternator.

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% : )