Sounds like you might have found the sweet spot for the boat/engines performance. It's hard to tell without a lot of testing unless you have a fuel flow monitor. Slower or faster speed may or may not improve those numbers (obviously).
I've still got to try another prop, and recheck mine, currently running a 19 pitch on a 150 horse.
Some of the numbers.
44mph - 18.5gph - 2.37mpg
37mph - 14.0gph - 2.64mpg
30mph - 11.0gph - 2.7mpg
4mph - 1.18gph - 3.38mpg
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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