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Hard to say without actually buying one and taking it apart. Some of these 'modules' contain nothing but a a resistor or two to slightly change the fuel mixture.
It may have some effect on mpg, but their claims are simply too good to be true.
All those wild claims in the e-bay add is not sending your BS meter off scale? Come on now. The "theory" that modern EFI cars are running rich all the time is just plain WRONG. They would never pass smog if that were the case. All modern engines are set from the factory to run lean-of-peak except at startup and full throttle. A "chip" can be just as phony as fuel line magnets and other devices that have come along every time gas prices go up.
The "theory" that modern EFI cars are running rich all the time is just plain WRONG. They would never pass smog if that were the case.
A catalyzer can easily smake a rich (though not overly rich) engine pass smog.
All modern engines are set from the factory to run lean-of-peak
You mean slightly on the lean side? Do you have any reference to that?
A "chip" can be just as phony as fuel line magnets
A fuel line magnet can not possibly have *any* effect on mpg, while the 'chip' can. Of course, the effect can also be bad, which is the case with many gas saving devices.