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  • Fuel Burn???

    I'm waiting on the 21 CC to show up (all darn day, too)and I am wondering. Just what kind of fuel economy are you guye getting? I am especially interested in the 225 'rudes on the 21's. This will be a lake boat until I relocate to Atlanta and then it'll be seeing Santa Rosa Sound in Destin on the odd weekend. It really is too much of a boat for the lakes around Dallas, but I like to think ahead. Anyway, what should I plan for an hour of fuel burn? A little fishing, a little tubing, a little cruising, and a little drifting will be the plan of the day.

    thanks

    ka
    1979 Mako 21 (sold)[br]1987 Mako 231/1997 Yamaha 225. Now the 231 wears an 01 225 Yamaha 4 stroke. [br]Cape Coral, FL

  • #2
    As a Bonanza Pilot, here is an analogy as told by an old outboard mechanic years ago: Devide the HP by a factor of 10, and this will give you an approx. fuel burn in gph, at max WOT. Given this, your 225 hp will burn around 22.5 gph at wide open throttle.

    Real world terms - expect anywhere from 2 to 2.5 miles per gallon, with a carbed engine, a little better perhaps with fuel injection.

    Hope this helps.

    Randy
    1988 Mako 231[br]Jackson, MS

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    • #3
      1979 mako21a, 1996 johnson225 carb. best fuel eco. is at 4500 rpms

      at 33mph. with a 14.25x19 prop. wot with a med load 5700rpms

      fuel eco. at above speed is 2.2 mpg. dave.
      [br]1994 Mako 215 Dual console Optimax 225[br]1978 Mako 19 with 90hp johnson[br]1996 Mako 22[br]1982 Mako 171 Angler 135 Black Max Mercury[br]1987 21b 225 Yamaha[br]1974 23 inboard Gusto gone.[br]1979m21 225johnson \"blue dolphin\" bought off this board and restored [br]with everyone\'s help!!Gone but not Forgotten....[br]1979 20 Mako 115 Suzuki gone[br]1977 19 Mako 115 Johnson gone[br]1976 23 Mako twin 140 Johnsons gone[br]1983 224 with closed transom and bracket[br]And 162 SOB (some other boats)[br]Venice Florida, Traverse city Mi.

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      • #4
        88 21B, 225 Johnson. 14 1/4 X 21 SST. Loaded cruise.....32 MPH @ 4500 RPM, 14.2 GPH = 2.25 MPG.

        Empty WOT, 52 MPH @ 6000 RPM. SUCKING lots of fuel.

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        • #5
          Interesting...How will different size props effect the equation? The boat finally got here right aroud sundown so I am up early this morning with a cup of coffee and a smile.

          DAMN THIS THING IS BIG. I did not realise how big until I saw it on the trailer.

          Pics and an update to follow.

          ka
          1979 Mako 21 (sold)[br]1987 Mako 231/1997 Yamaha 225. Now the 231 wears an 01 225 Yamaha 4 stroke. [br]Cape Coral, FL

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          • #6
            Alcedo, your 225 is a running machine, I dont think I could swing a 21 pitch prop and get into the right range. Makes me wonder if my tach is regestering right. boat came with a 15x17 on a 1989 225.

            I think my best speed so far is 42mph. All the speeds I have mentioned are with GPS. My fish graph has the speed indicator but it is high. dave.
            [br]1994 Mako 215 Dual console Optimax 225[br]1978 Mako 19 with 90hp johnson[br]1996 Mako 22[br]1982 Mako 171 Angler 135 Black Max Mercury[br]1987 21b 225 Yamaha[br]1974 23 inboard Gusto gone.[br]1979m21 225johnson \"blue dolphin\" bought off this board and restored [br]with everyone\'s help!!Gone but not Forgotten....[br]1979 20 Mako 115 Suzuki gone[br]1977 19 Mako 115 Johnson gone[br]1976 23 Mako twin 140 Johnsons gone[br]1983 224 with closed transom and bracket[br]And 162 SOB (some other boats)[br]Venice Florida, Traverse city Mi.

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            • #7
              When I first got the boat I had issues with the performance...Ring was talkin 50 MPH with his Merc 225, and we all know OMC has more azz than a Merc.[:x)]and I was only seeing 40 maybe......I suspected everything, got a new tach, tryed a different prop, made no sense.......then I moved my GPS from NMPH to SMPH.....DA !!! [xx(] amazing.

              That 50 MPH was with about 25 gal of fuel, no gear and just me, down hill, down wind, 6" chop .......etc.

              I really think it is the prop......the OMC SST is not the worlds best. I put a SST II (double cup) same size on it and could only spin 5600 @ 44 MPH. My old 78 22B had a 87 225 rude (2.7L), it would only spin a 14 1/4 X 19 Ballistic 5700 @ 41 SMPH, but would cruise at 3800 @ 28 SMPH. Beyond me, as the 21 is heavier, deeper, more boat all the way around.

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              • #8
                Want to sell that prop?? Hehe sometimes the right combination yealds great results. Your other numbers with the other props are more in my range. dave
                [br]1994 Mako 215 Dual console Optimax 225[br]1978 Mako 19 with 90hp johnson[br]1996 Mako 22[br]1982 Mako 171 Angler 135 Black Max Mercury[br]1987 21b 225 Yamaha[br]1974 23 inboard Gusto gone.[br]1979m21 225johnson \"blue dolphin\" bought off this board and restored [br]with everyone\'s help!!Gone but not Forgotten....[br]1979 20 Mako 115 Suzuki gone[br]1977 19 Mako 115 Johnson gone[br]1976 23 Mako twin 140 Johnsons gone[br]1983 224 with closed transom and bracket[br]And 162 SOB (some other boats)[br]Venice Florida, Traverse city Mi.

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                • #9
                  HeHe NMPH & MPH SOG was something Eddie and I were talking about during the Fundement.

                  He and I both keep our Gps on MPH. That way you don't have to do math in your head, Hmmmm let's see NMPH= 1.1MPH.

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                  • #10
                    Kingairpilot;

                    welcome to the site and welcome to Atlanta. It will be nice to have another person who enjoys the same things I do here. When do you officially get here? I trailor to Destin about twice a year with my 23 but in the meantime, your boat would be perfect for chasing stripers on Lake Lanier. BTW, is it just me or does anyone else notice there is a slight difference in performance between freshwater & saltwater?
                    Steven[br]1978 Powercat 232[br]One flat broke, the other almost ready to float!!![br]Atlanta, GA

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                    • #11
                      Had the new boat out on the lake all afternoon. FINALLY, working weekends pays off. The lake was virtually empty and we got to run around without having other yahoos to deal with. Rules of the road are not a big issue in Dallas. Anyway, got a whole punchlist of things that need a fixen. Trim sw, trim gauge, fuel gauge, power lever...uh, throttle (got to get away from the airplane more often), running lights, and this thing definately needs a top of some kind.

                      anyway, I'm happy, tired, sunburned, and dehydrated...what a wonderful day.

                      ka
                      1979 Mako 21 (sold)[br]1987 Mako 231/1997 Yamaha 225. Now the 231 wears an 01 225 Yamaha 4 stroke. [br]Cape Coral, FL

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