Re: I want a fuel-sipping cuddy!!
It's surprisingly not as bad as you'd think. I have a 25 foot cuddy with an oval port 454 as well, and have topped out at 53 MPH with a light load and perfect conditions. I also have a fuel flow meter that alos computes MPG in real time and can tell you that you were getting just over 2 MPG. You motor is only burning about 24 GPH at WOT and 13-18 GPH at cruise. At a cruising speed of 30-40 MPH, you are probably, like me, getting 2.4 to 2.8 MPG, depending on load and conditions. WOT does not hurt MPG as drastically as most people think it does.
Going 18 MPH in rough water yields me 1.8 MPG. Towing 7 kids on three tubes at 20 MPH yields me 1.4 MPG. Going 7 MPH yields me 2.4 MPG ( I'm actually more efficient getting in plane and going 32 MPH than I am and 7 MPH).
Thanx for the input............ I am actaually pretty pleased with the fuel consumption on my boat. She is 25 1/2 feet, 5,300 lbs dry w/ the 7.4 L Bravo-1 w/ a 83 gallon tank. The boat has over 1300 hours on the origional engine and drive. Your consumption figures seem pretty much in line with what I'm seeing, give or take.
Spent a week on a lake in NH in August, using her constantly joy riding / exploring at nice 25-30 mph speed, lots of no wake speed time, the now and again full power run (sure made the 10 mile cross lake journey in a hurry), pulling a tube for a while almost every day and used less than 120 gallons of fuel (to my surprise) all week. Never attempted to calculate, as it would have been a huge PITA with so many variables... But, it equates to 17 gallons per day (120 gallons used in 7 days) and we were on the water alot.
Can run 40-45 miles, up the Hudson River and back, using around 35 gallons, give or take, at just around 30 mph thru water speed. Boat / engine loves the <> 30 mph speed (thru water), as it seems to be the sweet spot for fuel consumption / comfort.
The comments I made about fuel in the 1st post were pretty much "tongue in cheek" attempts in engineer type dry humor. When it's all said and done, if I were so concerned about fuel consumption, I would have no business owning a fairly large cuddy sport type boat powered by a BBC able to hit 50 + mph, like this one. LOL