Oh, another thing, regular Ethanol gas is 10%% not 15% as you state. Some states have been asking for the move (mainly mid states where the farmers have been pushing for more profits) to 15-20% but 10% right now is the standard. Even there are few car engines that can take the extra ethanol without causing serious internal damage to the engine. If you are buying your gas at the marina most/all sell non ethanol gas!!