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Thread: Merc 300R Fuel Consumption
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08-03-2022, 12:35 PM #1
Merc 300R Fuel Consumption
Guys,
I did a little searching but couldnt find anything.
What does a 300R burn on average per hour at wide open 6400 rpms ?
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08-03-2022, 08:44 PM #25000 RPM
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LOLOLOL......when I'm running mine at WOT I'm too busy to look. At 4000 I burn 11 gph at 4500 16 gph. The 30 gph figure sounds about right, but I want to say that I've seen 38 gph but not sure, at WOT.
Last edited by Capt j; 08-04-2022 at 10:22 AM.
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08-03-2022, 10:52 PM #35000 RPM
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09-05-2022, 04:16 PM #45000 RPM
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My 300xs burns about 26-27 GPH at 5950 RPM. I would expect that a 300r would burn slightly more.
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09-21-2022, 02:42 PM #55000 RPM
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My 300R yesterday at WOT was burning 26.8 gph at 6260 with a fishing load. I've seen as high as 30 GPH at 6400 rpms with a bigger prop and light load.
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09-21-2022, 07:30 PM #6Supporting Member
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I don't know what the burn rate per hour is but I looked at my smartcraft screen tonight in 36 Doug Wright and at 83 mph it gets 2.65 mpg. This is at 4,000 rpm and the engines are not making any boost yet-pretty good all things considered.
Joe
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10-13-2022, 09:18 AM #7
The 4 strokes really shine at cruising speeds for mpg. My friends with 300R's get double the gas mileage I get with my 300X. Added benefit is the 300R burns 87 octane not the premium I need to run. I have 300R's on order and should be here real soon.
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10-13-2022, 09:40 AM #85000 RPM
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If the speed and mpg are correct, the engines are pulling 31.3 gph at 4000 rpm. I assume those are twin engines so 15.7 gph per engine at 4000 rpm. I find that very reasonable. I have a 24 ft Checkmate with a single 300R, and at 3000 rpm I am running about 29 mph and pulling 6.1 gph which equals 4.75 mpg. I think at 4000 rpm mine would pull about 8 gph but it would only be doing around 42 mph. Considering the weight your pushing and speed your running, that's impressive.
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10-14-2022, 10:30 PM #95000 RPM
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10-20-2022, 10:04 AM #10
Joes numbers are a 36 DW with 450s
24 Twister
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10-25-2022, 01:33 PM #115000 RPM
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Hi!
This is a Phantom 25 with a 450R:
2000 rpm @ 29 mph @ 20 liter / 5,26 gal per hour
2500 rpm @ 36 mph @ 27 liter / 7,1 gal per hour
3000 rpm @ 42 mph @ 40 liter / 10,5 gal per hour
3500 rpm @ 52 mph @ 48 liter / 12,6 per hour
4000 rpm @ 59 mph @ 59 liter / 15,5 gal per hour
4500 rpm @ 67 mph @ 72 liter / 18,9 gal per hour
5000 rpm @ 75 mph @ 85 liter / 22,3 gal per hour
5500 rpm @ 83 mph @ 126 liter / 33,15 gal per hour
6,000 rpm @ 89 mph
6300 rpm @ 94 mph
I do not have figures for wot, but I estimate 170 liter per hour.
Cheeers, ToffenLast edited by Toffen; 10-25-2022 at 01:37 PM.
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10-25-2022, 04:58 PM #125000 RPM
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That is really impressive Toffen. My 300R pulls about 6 gph @ 3000 rpm in my 24 Checkmate, but it is only doing 29 - 30 mph. So you should really compare the fuel consumption at similar speeds not similar rpm. Your 450R pulls 5.26 gph at 29 mph!! That is actually slightly less than the 6.1 gph mine pulls at that same speed!! Will it stay on the plane at 2000 rpm?? How heavy is your Phantom with the engine, fuel, you in it and ready to run? I would guess mine is around 3100 - 3200 lbs (about 1430 kg) with my wife and me in it.
Best Regards,
Glenn
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10-27-2022, 08:46 AM #13
For me, i would rather know how much fuel is burned per hour at a certain RPM. There are so many variables with speed vs. rpm for each boat.
The one thing that may change is how much load is being applied at an RPM affecting fuel burn.
My cruising speeds/rpms change drastically with props but i think looking at a fuel burn per hour at an RPM is more reliable than speed. I could be wrong though, so im here to learn.
Im running a 300r on a 23' V bottom, and need to know my range - reason for the post.
Two of my setups are
26 pitch pro max - 5000 RPMS @ 60/62 mph
26 pitch Bravo FS - 5000 RPMS @ 56 mph
Pretty big difference in range at an hour run time, but how much does load affect the fuel burn on that.
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10-27-2022, 09:00 AM #145000 RPM
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I agree, we are saying the same thing. I also have a 300R with a 24 Bravo FS and a 24 ProMax. If you divide your speed in mph by your fuel flow in gph you you get mpg. Your best range will be at your highest mpg. In the case of Toffen's Phantom 450R based on his numbers 2000 rpm = 5.5 mpg, 2500 rpm = 5.07 mpg, and 3000 rpm =3.80 mpg. So his range is best at 2000 rpm if he really wanted to run the engine as such low rpm. His engine uses more fuel flow at 3000 rpm than mine and his mpg is a bit less, however at 2000 rpm his mpg is better than mine. At least that is how I would view it. In my case their is less difference between the FS and the ProMax but the ProMax will run 76 mph loaded light but the FS more like 73 mph. However, if I load the boat with more fuel and weight the slip increases on the ProMax more than the FS. I have ordered a labbed 26P ProMax to try, and I would guess that should improve the mpg at 3000 rpm in my case.
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10-27-2022, 10:25 AM #155000 RPM
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Get a vessel view or smart craft gauge, either will show you real time GPH. Load changes it a lot. I have a 20' Lake and Bay backwater flats boat 300R. 10" bob's jack plate. I get on plane with the motor down, at 4000 rpms trimmed down I burn 13.8 gph and only like 42 mph, once I start trimming up speed will increase to 46-48 mph, BUT GPH will also go down to 11.8 when trimmed properly. So load has a lot to do with GPH even at the same rpm. 4500 rpms, I'm around 52 mph usually and 15.8, but again if I trim down and run with the bow buried (maybe cause it's rough), GPH will go up to as much as 17.2 GPH. If you're spending this kind of money on the motor, why not spring for a vessel view, or at least a smartcraft gauge that will show fuel burn, as well as other functions like water pressure.
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