How are the engines working out for you, and did you ever work out the props? I'm going to try 17x16 props and 1.91 / 1.6 Velvet drives. Especially - how many gallons per hour do they burn? I got a couple 6.2s and am trying to size the fuel tanks. Are two 50 gals too small? I'm guessing about 5 GPH at full throttle, but can't get any real boating figures.