By the way, the technique is illegal in some places. And let's face it, if you get caught, you have approximately zero chance of outrunning the cops when you don't have your damned engine running.
What is it?
A magnet. Wrapped in rubber. We wanted to make some more jokes and comments about this thing but the makers didn't give us anything to work with. The fucking thing is just a magnet that you attach to your fuel hose. What the hell can we say about that?
What's it supposed to do?
The general theory about devices like this is that they align the gas molecules as they pass the magnet. Once aligned the gas molecules burn more efficiently and lower emissions and ultimately lead to world peace. The makers of Motoflow go one better though and claim that their device "conditions" the gas and adds energy.
You'd think that the people who make the gasoline would go ahead and do that at the refining process, since it seems like whatever is accomplished by one of these ...
... could probably be done even better with one of these:
Of course if we asked the oil companies why they don't bother to line up their gasoline molecules nice and neat before selling them to us, their answer would surely be, "Because fuck you, that's why!" And then they'd light a cigar with a billion dollar bill.
What will it really do?
Nothing really bad, thank God. Unfortunately it also does nothing really good either. Likely it will just sit there on your gas hose, taking up space, a telltale sign of gullibility for every mechanic who looks under the hood. One glance and they'll know they can charge you $50 to realign the air in your tires.