The biggest advantage of T4 over pump gas is that our current pump gas contains ethanol, an alcohol-based alternative fuel manufactured by fermenting and distilling starch crops that have been converted to simple sugars. This is not good for the lifespan of valve trains, fuel pumps, and top end gaskets on small engines like those found in dirt bikes. Ethanol in the fuel can leave a gummy substance that clogs fuel pumps (or jets on carbureted bikes) and causes early deterioration of head gaskets and O-rings, shortening the life of your engine. Another major problem is phase separation; if water gets into the fuel, this can cause the water/ethanol mixture to sink to the bottom of the tank where the fuel pickup is. Water inside your engine can cause the fuel pump to stop working and also can make your bike miss and sputter.