downshydrocustoms www.youtube.com Flogging the same dead ox, over and over and over again: The manifold absolute pressure (MAP) measurement is used to meter fuel. The amount of fuel required is directly related to the mass of air entering the engine. Fool the engine into "thinking" less air mass is consumed, and it will mix less gasoline into that mass--- leaning out the engine, slightly increasing MPG, slightly decreasing horsepower. The oxyhydrogen ("HHO") bubbler / "cell" (which it isn't ...