This engine and a new Kentucky mousse can muffler has about half a gal of fuel thru it. I ran it yesterday, 50% humidty 75deg and it ran 18.7k on 15% Wildcat and 9x4 prop, 17.5k with a 10x3. I paid 90 for the motor and 30 for the can and would like 90 for both. This is a great motor and ready for anything. I'm selling to finance a Burrito!!