Hmm...sceptical too, thinking that if it really does increase the mileage, have there been any testing to the long term use? How will it affect the engines total mileage? If i get this right this magic additive is "cheating" the motor sensors to go on to a more thin mixture, so more air -> less fuel -> more mileage. Cant see how else this could work? , unless the pill itself burns like gas, thus saving gas!
Well to continue, in my experience the too thin mixture makes the engine "not work too long"
in other words, go bang. This happens in the long run, when the mixture is a bit wrong, naturally this happens due to a fault, like a leak in the intake for the engine, after the air-volume-meter. But i could see this happening with this additive too.
well yes, thought about the motors internal friction,
This could actually increase the cost-effectiviness of the motor thus more mileage, yes its possible this way, still i am sceptical.