U know, a lot of this mechanical stuff we do is really about theory. I was taught that our infernal combustion engines are at best only 85% efficient sso any thing that gets a little more power from a drop of fuel will pay fro itself, at least down the road. Somebody once said if we could put all the fuel saving devices that have been invented on our cars, we would save so much gas we would have to siphon some out each day. Many of these mods. are dependant on something else to gain full advantage.