Fuel savers

Hello, I have here an advertisement of Air-Tec (www.air-tec-systems.com) which promises 10 % fuel savings (and other nice effects) what do you think of such electronic components ? is the waste of money or does that really bring what ? have you made experience with it ? to the mechanics/mechatronicians: is this theoretically possible ? do you know other, comparable systems ? Thank you for your opinions Kone