most economical 200hp to put on a v20 cc?

[labii]

I have a 2004 150hp yamaha 2 stroke and it will top out 45-46 mph depending on the load .
My friend has a 225 optimax on his v-20 and he tops out around 50 mph . We burn about the same fuel at cruse , but his rides much lower in the stern due to the added weight .
I would be willing to give up a little hp for signficant weight savings .