I've been running the new boat a lot and she is already broken in. I am going to dedicate an afternoon to pure performance tests, but here is a quick report.
Test Conditions
Boat: 2003 31 Sea Vee "HeaVEEweight"
Engines: Twin 225 Mercury OptiMax
Fuel: Loaded with 250 gallons
Water: Loaded with 40 gallons
2 People on board (combined 400 lbs)
3 batteries, electric head, 6 fishing rods and associated gear
Results for cruise:
Each engine was burning 9.1 gallons per hour for a combined burn of 18.2 GPH
Speed was 37.1 MPH measured via GPS
MPG: 2.04 @ 4000 RPM