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Looking for GPH numbers on 26-30' CC's with twins

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  • 4 Post By 54bullwinkle
  • 1 Post By swellhunter

Looking for GPH numbers on 26-30' CC's with twins

Old 07-03-2019, 08:31 PM
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Default Looking for GPH numbers on 26-30' CC's with twins

I am basically in between deciding on a 26-29' center console that will have twins. While I'm in the deciding phase I'd like to hear some real numbers. I always see GPH but I need to know what cruising speed for these numbers, and what wide open throttle will get you
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Old 07-03-2019, 09:47 PM
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World Cat 280CC-X: full fuel, ice, live well, freshwater, Yeti 65 with sustenance and 5 large adults got me 2MPG or better until 18GPH. At that point, dipping eventually to 1.5MPG running 40MPH burning 26GPH. I am over propped and WOT should be closer to 46-48 light.
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Old 07-04-2019, 12:23 PM
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WC 290 twin 250's Average 1.4 MPG @ 30 MPH. Could do better but that prop was out of spec. I heard of a guy that was run suks that was doing much better than me.
Freinds 32, get 2.0 MPG on a stepped hull mono at higher speeds than me.
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Old 07-04-2019, 03:51 PM
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26' CC with twin F200 Yams is 1.9 to 2.2 gph depending upon weight and sea conditions
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Old 07-04-2019, 05:15 PM
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27 seahunt gamefish 2mpg at 28-30mph with twin 150s 3-4 guys normal canyon load
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Old 07-08-2019, 06:05 PM
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you know Yamaha publishes performance bulletins for such things.
Look hard at how they did the test as in colder air, the performance can be batter than in hotter air.

For my boat, Yamaha panel numbers are a tad below the performance bulletins though.
I"m about 2mph slower and .1gph less than the specs. Possibly temperature but also cause I"m never on calm glass water when I run. Wave conditions will likely lower the #'s I've found.

So much to a boat, Wave conditions determine how fast I can go, not the engine. I go as fast as the waves allow me to go w/o beating up the boat or myself.
From one boat to the next, Likely the boat, cost and the features you like will out weigh one being 2mph faster (at least that's my opinion)
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Old 07-08-2019, 06:17 PM
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You will be in the 1.5 to 2.0 mpg range for most boats in that size with twins
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Old 07-09-2019, 09:01 AM
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Not all performance reports are useful for real world heavy load fishing. In general put as much HP on the back of the boat as possible. Why? Not for top end speed but for the power to turn high pitch 4 blade props.

look at guys with Onslow Bay 27s with 350 Verados turning 23P 4 blades doing 30 knots at over 2mpg but still able to plane at 14 knots with no trim tabs when itís rough and still get similar numbers. Thatís what you want.

I donít think there is a more efficient package than an OB 27 with 350s going right now.
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Old 07-09-2019, 10:14 AM
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Last trip 2001 Contender 25 open 28LOA full tower with controls w/Yamaha inline F200 XCA, props Yamaha Reiance SDS 14.25 x 17p, 190 trip miles, burned 83 gallons of fuel 2.29 mpg. This was a 10 hour day running and trolling. Took a while to get her dialed in but she is pretty close now.
Previous motors were Yamaha 200HPDIs basically the same trip was 195 trip miles 105 gallons of fuel 1.87 mpg. In both cases GPH varied on speed running verses trolling.

Last edited by offshore3144; 07-09-2019 at 10:19 AM.
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Old 07-09-2019, 04:00 PM
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Regulator with twin 250s at 30 kts I am burning 25 gph. I average 1.2 mpg on an offshore trip.
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Old 07-09-2019, 06:47 PM
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Boat weight, speed and seas are main variantes but 1.3-2 mpg at a 25 mph cruise is common for twins.
Competition 25+ bracket and a single 300 will see close to 3 mpg.
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Old 07-09-2019, 06:50 PM
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Originally Posted by 54bullwinkle View Post
You will be in the 1.5 to 2.0 mpg range for most boats in that size with twins
^^^^ This. Bullwinkle is spot on.
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Old 07-09-2019, 06:58 PM
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onslow bay 27 with 300 verados, 1.6-2.2mpg at 30-40mph depending on sea conditions. 1.3-1.5mpg at 40-50mph anything above 50 it drops to 1mpg. I typically cruise as fast as conditions will allow unless I know i'm running a long ways then I try to keep her under 40. but the boat likes to go fast and I've found the speed to slow creep up on me.

you can expect 1.5 to 2mpg out of most boats in this class range. with the exception being a 30 with steps like a 30st contender, that boat is extremely fuel efficient.
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Old 07-10-2019, 07:39 AM
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Originally Posted by lyman24 View Post

^^^^ This. Bullwinkle is spot on.
x3. 301 Cobia, twin 300's. full tank of fuel, 4 people, miscellaneous gear 3500 RPM, 32mph, between 1.6 and 1.8 most of the time.
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Old 07-12-2019, 07:52 AM
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If propped correctly, outboards will burn approx the same GPH at the same RPM across a variety of similar boats (either at idle/slow speeds or once fully planed). For instance a Yamaha F150 will burn approx 8GPH at 4200-4400 RPM and twin Yamaha F150s will burn double that. It's easy to research performance reports, determine if the boat is propped correctly (many performance report boats are overpropped for a 'fishing' load) and then you can extrapolate expected fuel economy to other similar boats.
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Old 07-12-2019, 08:47 AM
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As stated a few times above the 1.4-2.0 is right for most boats.

Everglades 273 with a decent load of gear, people, fuel will run 1.6-1.7 at 30 MPH- pretty much around the sweet spot,
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Old 07-12-2019, 12:17 PM
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All of these posts are really reinforcing my decision in the World Cat purchase. At 30 MPH I'm burning 12-14GPH with full fuel and 5 adults. As mentioned previously, I don't start seeing worse than 2MPG until I push past 36MPH, 18GPH.
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