What model Nav do you have?
Boaties usually work economy in gallons per mile , lol my father had a pair of 350 hp perkins v8 turbo diesels , and got 1 gallon to the nautical mile , the boat on here wouldn't be a lot better maybe 1/2 to 3/4 a gallon a milewhats that set u back in fuel for a weekend away
it weighs about 7 ton, and my Nav is a 04 D22. /
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