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Have you looked at checking proper engine mounting height and tried different props?
You're a little underpowered probably. I have a '96 Boston Whaler Dauntless 15 with a Honda BF60 4-stroke and get 8-9mpg. I think my boat is bigger, has a sharper bow and more deadrise (less efficient). Mine tops out at 35mph, planes at a little over 10mph and cruises comfortably at 20mph/4ish KRPM.
If you can find something with a bit more umph but not much heavier, that may change your ride significantly. What is the hull rated for?
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