My old V20 cc that cterrebonne is now rebuilding had a 3 liter Merc 225 carb saltwater series motor. The boat saw 53 top end with 40mph cruise and averaged 2.5mpg. If I had another, I would go with a 250 Opti. I recon that is the best combo of power and efficiency.
FWIW, with the 3 liter on the back, the balance was great and I hardly ever used my tabs.
Also FWIW, be careful with weight placement once you bracket your boat. Even if you are able to get enough flotation at rest with the big bracket, you may still have porpoising issues if you have too much weight aft. You want to ensure that you don't find yourself in a position where you need full tabs and max motor trim to run a low cruise speed.
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