The Royal Bahamian Defense Force still has a 27 SeaMaster (flybridge model) that now has twin 250 4-stroke Yamaha's. They are not on brackets, but on the transom that was cut down for outboards back in the mid-1990's. I understand from one of the guys that it cruises at about 23-25 mph, and has a top speed of nearly 50 mph. No clue about fuel usage, though.
The boat was first rigged with twin Yamaha 220 hp "Specials" back in '94, and actually had slightly better top end performance then, with a top speed of about 52-53 mph.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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