[jmk]

This brings back great memories. Forget the manufacturer test data for a used boat. Some extra gear on the boat and a bit of slime on the bottom and props and you can be way off this number on fuel burn. Post back and let us know how it goes, but I know this configuration extremely well, and I doubt 2800 will get you on plane. 3200 would be more like it. Did you sea trial your boat and if so do you have numbers? Fuel burn will change a lot with the level of your tanks. 400 gal of fuel weighs a lot! On light tanks expect more like 0.55 or 0.60 mpg (standard miles, not nautical), and on heavy tanks below 0.5. It's just the nature of the beast--a heavy boat that makes for fantastic seakeeping, a somewhat wet ride, but burns a lot of gas. Plan with these numbers and perhaps you will do better.

Coat your windshield with RainX before the trip. This makes a big difference. And buy some rubber stoppers to fit into your fuel fills below the cap. Stopped all my chronic ethanol separation problems and I always find some water on top of them when I refill. By the way, there is a fuel crossover valve.