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Message: <blockquote data-quote="DaleH" data-source="post: 401467" data-attributes="member: 15636">One rule of thumb is that an OB of about 75-80% of the hull maximum rated horsepower will give the best fuel efficiency. To back this up, there are some boat tests I've seen from Bob Stearns, a noted marine/boating author. He tested the same boat/same hull with a 90, 115 & 130 or 140hp motors and the 115hp was the most furl efficient. It was only 3-4mph slower at WOT, but more impressive, was only 1mph slower at the most efficient cruise speed, yet yielded about 3/4 mpg better fuel efficiency.</blockquote>