I had a 2000 3/4 ton with a 6.0 liter and a 2007 1/2 ton with the 5.3 liter
Mpg highway not towing was 13 for the 6.0 and 17 for the 5.3
Towing my X-star they both got 9-10 highway.
Your boat is much lighter, so in my opinion anything over the 5.3 liter is a waste.
I originally got my 6.0 to tow my 30 foot Formula (9000 lbs with trailer)
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I was njskier on here.
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