CO symptoms are similar to seasickness or alcohol intoxication. CO can affect you whether you're underway, moored, or anchored.You cannot see, smell, or taste CO.CO can make you sick in seconds. In high enough concentrations, even a few breaths can be fatal.
PROBLEM 4: ETHANOL CAUSES LOST POWER PERFORMANCE AND DECREASED FUEL ECONOMY.
Ethanol does not produce as much energy as gasoline, losing up to 20+% of its power. E10 fuels result in decreased performance, reduced throttle response and greatly reduced fuel economy. Unburnt fuel leads to carbon deposits.
All of the above information was provided by the US Coast Guard.