congress in all of thier wisdom has mandated that all gas formulated in the us can no longer have mtbe as an oxeginate it is to be replaced by a 10 percent ethenol blend. this is bad for 2 cycle engines using anything but a synthetic oil. guys i'm no expert on this the local boat dealer said to run notheing but synthetic oil, and to put a fuel water seperator in the supply line. be carefull and any input would be appreciated. higbee.