Tsunami/bracket power options

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My Sceptre-to-Savage project is up at G-Crafts with Bobby now. I was thinking about a stainless marine bracket with twin 115 4 stroke Yamahas. Top end in the high 30's will be fine with me. Yamaha's web site shows performance data on a 23'6' Sailfish with twin 115's. the "sweatspot" is 4000 rpms, 26 mph, 9.5 gpm and 2.85 mpg. Whats wrong with that??

Took my other 23 Sceptre to the Georgetown Hole last Friday. burned 110 gal with the old 225 Suzuki 2 stroke. Total trip distance on the gps was 156 s-miles (including trolling). 5 nice dolphin and wahoo (first trip in the boat)

This discussion has me thinking about twin 150's but just how many days do you meed to go 40 mph offshore??

Phil