Gasoline residues build up on an engine's intake manifolds, valves and in ports. Deposit formation restricts fuel and air flow upsetting the delicate fuel/air ratio that is vital to engine efficiency. This causes serious drivability issues like rough idle, power loss, reduced gas mileage, and increased emissions. Installed at every fill up, BG Supercharge II keeps the fuel system clean and free of fuel deposits. With special stabilizers that prevent fuel oxidation, and gum and varnish formation, it prevents rust and corrosion and provides long-term fuel storage stability. BG Supercharge II - Prevents costly repairs caused by fuel related deposits - Restores fuel economy - Restores horsepower - Prevents increased harmful emissions - Protects against the harmful effects of ethanol - Maintains engine performance