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  1. #11

    Re: Hatteras 67 CPMY burn rates

    That’s the difference.
    Randy Register - Kingston, TN
    www.yachtrelocation.com
    www.Safes4Guns.com
    aka Freebird aka Sparky1
    1965 41DC #93

  2. #12

    Re: Hatteras 67 CPMY burn rates

    900 HP just means he can consume more fuel if he wants to go faster. Not that much faster, but faster.
    If all is working properly, as stated on another web forum, just below hull speed will offer the best MPG and GPH per speed.
    I see no difference on responses from the other web post.
    Attached Images
    Last edited by Captain Ralph; 04-17-2022 at 04:19 AM.

  3. #13

    Re: Hatteras 67 CPMY burn rates

    Engines size makes very little difference on fuel burn per horsepower produced. If it takes x hp to push a hull at 10kts, most engines will use the same amount of fuel to produce that x hp

    Example…. The MTUs 2000hp 16V2000 in the 116 i run only burn 20gph at 11kts, combined.
    Pascal
    Miami, FL
    1970 53 MY #325 Cummins 6CTAs
    2014 26' gaff rigged sloop
    2007 Sandbarhopper 13
    12' Westphal Cat boat

  4. #14

    Re: Hatteras 67 CPMY burn rates

    Randy Register - Kingston, TN
    www.yachtrelocation.com
    www.Safes4Guns.com
    aka Freebird aka Sparky1
    1965 41DC #93

  5. #15

    Re: Hatteras 67 CPMY burn rates

    My old 61 with 650 hp 1271's burned 18GPH at 10K, also verified by Floscan and many hours of use......Pat

  6. #16

    Re: Hatteras 67 CPMY burn rates

    First off these big MY’s roll like pigs. Not the best choice for a dive boat. Better off to get a CC for that purpose. I was just helping Freebird deliver a 58 series11 wide body. We took maybe a 3-4’ seas on the beam lamps broke furniture went flying boat looked like a bomb hit it. True the stabilizers were inop but they’re not effective at anchor or drift diving either.
    As far as fuel burn you’ll hear people regurgitate this 1mpg figure at hull speed. Anyone with half a brain should understand that a boat doesn’t run on rails tracks tires. It operates in a medium of wind waves zig zagging drivers and autopilots. I know my boat will burn more total fuel when it’s rough than calm and sometimes it’s considerable. I’m a charter fisherman so I really only operate 2 speeds 2100 and 850 which is 42 and 12 gph respectively. 850 is out trolling speed which is about 8-9 knots that’s with 525 hp 12/71’s. That’s kinda close to 1 if you’re talking statue mpg. FWIW we just delivered that 58 with 650 hp8/92’s 10 days 1000 mi from basically Tampa Florida to the Mississippi Tennessee line. We ran every day at 1300 rpm which yielded 11 smph I kept pretty detailed logs on running time and estimated fuel burn at a conservative 12gph. We topped the tanks at Apalatchacola fl and then at Demopolis Ms the aft fuel gage was inop and the fwd suspect. Bird with his 1 mpg estimated the aft tank would take 300 gal my time and fuel flow estimate was 369. We put 454 gallons in a 508 gallon tank. Kinda a holy chit moment that close to running out we did have about 100 gal in the fwd tank but both engines were running off the aft which wouldn’t have been a good thing to have both die at once. In any event when I ran the actual hard numbers we were at 16 gph a far cry from 1 smpg. So take all these numbers with a grain of salt because what you will see in the real world probably won’t be the same.
    "DON'T BELIEVE ANYTHING YOU READ OR HEAR AND ONLY HALF OF WHAT YOU SEE" - BEN FRANKLIN




    Endless Summer
    1967 50c 12/71n DDA 525hp
    ex Miss Betsy
    owners:
    Howard P. Miller 1967-1974
    Richard F Hull 1974-1976
    Robert J. & R.Scott Smith 1976-present

  7. #17

    Re: Hatteras 67 CPMY burn rates

    I thought the 1mpg thing only applied to the normal beam boats not the widebodies?

  8. #18

    Re: Hatteras 67 CPMY burn rates

    Oh boy here we go…
    Dave & Trina
    Benedetto
    1989 60MY HATDK310
    Sturgeon Bay/Ft. Lauderdale

  9. #19

    Re: Hatteras 67 CPMY burn rates

    Quote Originally Posted by Sadey View Post
    Oh boy here we go…
    HaHa wait for it.......
    "DON'T BELIEVE ANYTHING YOU READ OR HEAR AND ONLY HALF OF WHAT YOU SEE" - BEN FRANKLIN




    Endless Summer
    1967 50c 12/71n DDA 525hp
    ex Miss Betsy
    owners:
    Howard P. Miller 1967-1974
    Richard F Hull 1974-1976
    Robert J. & R.Scott Smith 1976-present

  10. #20

    Re: Hatteras 67 CPMY burn rates

    There is a huge increase in fuel burn when you go even slightly faster than hull speed. If you want to get near 1 mpg, you need to be at 9kts or less.
    Sky Cheney
    1985 53EDMY, Hull #CN759, "Rebecca"
    ELYC on White Lake--Montague, MI

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