Your carburetor will stay sparkling clean with pump gas as long as you run the engine 2-3 times a year. Modern gasoline already has a lot of cleaner in it. The oil we mix with gas goes a long way toward keeping corrosion out of the carbs, especially if its petroleum. Using glycol or castor based oil [that can mix with alcohol] can cause corrosion and blockage over time, oil made to mix only with gasoline seldom will.