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The propeller load curves from the DD book show under 40 gph for a pair of 550s.
The measured fuel consumption from a pair of 475 hp 6V-92s in a 1987 Bertram 42 Conv, 39,600# displ. (full fuel & water, 6 people, 1200# gear) show over 60 gph.
Obviously, your mileage may vary.
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