motor weights, too much?

[Bushwacker]

bushwacker, how fast will your 20 go w/ the 150?

I've seen 49.8 mph on the GPS with just me and a full tank of gas aboard with the top down, running a 4 blade 20" pitch prop. A 3 blade prop with a little less pitch would probably be a little faster. Also has bottom paint on it which may cost some speed, but the bracket is probably worth an extra 2-3 mph. However in normal cruising/camping trim I'm loaded very heavy, close to 4000 lbs total, so I run a 15x15 4 blade prop in that configuration, which will push it to about 40 with the big bimini top up. As Sandy said, hole shot is pretty decent. A couple of months ago I ran 235 miles on the St. Johns river in the 4000 lb configuration and burned almost 50 gallons of gas, which works out to 4.7 mpg, so I'm fairly pleased with it's performance, considering the load I was carrying. With the 20" prop and a light load I'll average over 5 mpg.