We agree with Chevron that, instead of draining the tank, the better plan for most boat owners is to add a quality fuel stabilizer product to a nearly empty fuel tank and then fill it up nearly to the top with quality gasoline. Leave just a little room for expansion. Then, run the engine for a few minutes to allow the treatment to circulate throughout the system. Marine fuel additives are very concentrated – for example it only takes one ounce of Techron Marine to treat 10 gallons of fuel – so follow instructions and make sure you are dosing the fuel properly. Chevron says Techron Marine Fuel System Treatment has been scientifically engineered to keep fuel fresh for up to 24 months. A quality marine fuel additive like Techron Marine Fuel System Treatment is also beneficial for engine and fuel system cleaning and corrosion protection in the harshest environments — especially in salt water. Techron Marine Fuel System Treatment can be used as an additive with every fill up, not just during storage, to help keep a boat’s fuel system and engine running clean, strong and at peak efficiency. It works in all types of gasoline-powered boats including two-stroke, four-stroke, carbureted, port-or electronic fuel-injected and direct injected engines.