Never done that to any of my cars. BUT; More power AND better fuel consumption ?? Reread your high [middle] school Physics and Chemistry books ! Power comes from burning fuel => you can have more power OR better fuel consumption - NOT BOTH.
Finally got my LeBra frontend mask. Took a while to get it (about two months) but it was well worth the wait. Some people don't like them but if you use a good wax and remove it regularly for cleaning you won't have a problem. I also used some Road Trip Tape along the fender well edges where the mask clips onto.