I think it helps in that it makes your wallet lighter so less weight to pull along!!!!!!!!!! I tried it, and Personally I didn't notice a difference, but then I don't think that you would notice on the road. Maybe on a track or strip where you are giving it the beans, or a dyno. But personally I think it's not all it's cracked up to be, jus a gimmick to make you pay more for your petrol in hard times!!!!!!!! call me a synnic, but how much money did shell make last year!!!!!!