I don't see a trailering cover on the boat. Covering the boat will help your mileage quite a bit. Remove that bubble windshield while trailering and use a flat cover for the best effect.
However, I'm thinking the additional weight is doing the most damage. My 17 1/2' Alumacraft causes 10mpg with whatever tow vehicle I use. I don't own a trailering cover.
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