What fuel economy are you getting?

20ft welcraft, 350 magmpi, bravo 1 leg, 17" mirage plus
usually 3300-3500rpm is my sweet spot
best cruise i get is 2.8mpg when light and 1/4 tank
2.6mpg with full complement of fuel n fishing buddies

numbers from my smartcraft gauges and gps
 
38ft Fountain 300verado’s x3 4700rpm 45mph 44gph. That’s fully fuelled with six passengers. Once I’ve burned off 800 or so litres she lightens up and is a little quicker for the same gph. Pinned and trimmed goes 60mph 5900rpm not sure the gph but it’s lots!!! With the the trim tabs backed off she will slowly fall off step under 40mph. Never get to watch the fuel flow diagnostics much because utmost attention is always directed to what is in front of me rather than what the gauge has to say. I could never afford the fuel thankfully my passengers pay. Best mpg is one engine running at about 2200rmp 7kns 3.2 gph.
 
noluck said:
24' hardtop cuddy, 7 gph 24-29knt cruise speed inboard cummins diesel
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23' Hourston - Volvo D3 200 - similar performance as No Luck - cruise at 3000-3500 and 25-30 mph - burning 6-7.5 gph [US]. Boat weighs ~6500 lbs. I usually cruise 3200 and 6.5-7 gph depending on water conditions.
 
Eden Island said:
23' Hourston - Volvo D3 200 - similar performance as No Luck - cruise at 3000-3500 and 25-30 mph - burning 6-7.5 gph [US]. Boat weighs ~6500 lbs. I usually cruise 3200 and 6.5-7 gph depending on water conditions.
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not too many of us small boat with diesels
 
22 Seasport and 200 Yamaha carbed 2 stoke, run it at 4000-4200 rpms at just under 30 mph. Under 10 gph. I have done runs from Sooke to Bamfield which took 3 hrs and burned 28 gallons...also a round trip from Sooke to Renni and back (1.5 hrs each way) ..same result 28 gallons.
 
Fishmyster said:
38ft Fountain 300verado’s x3 4700rpm 45mph 44gph. That’s fully fuelled with six passengers. Once I’ve burned off 800 or so litres she lightens up and is a little quicker for the same gph. Pinned and trimmed goes 60mph 5900rpm not sure the gph but it’s lots!!! With the the trim tabs backed off she will slowly fall off step under 40mph. Never get to watch the fuel flow diagnostics much because utmost attention is always directed to what is in front of me rather than what the gauge has to say. I could never afford the fuel thankfully my passengers pay. Best mpg is one engine running at about 2200rmp 7kns 3.2 gph.
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WOW!!!! How much do you charge for a full day offshore charter??
 
Anybody know if new motors get poorer gas mileage then they improve over time? My new Yam F250 seems to be using more fuel that the 16 year old f225 I had.
 
pescador said:
Anybody know if new motors get poorer gas mileage then they improve over time? My new Yam F250 seems to be using more fuel that the 16 year old f225 I had.
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Highly doubt you'll notice any difference in a yami. I'm pretty sure the Etecs have a break-in period that probably uses excessive oil so they would improve after the break-in period. But the yami shouldn't change too much.
 
26' Hourston with a 320hp GXi Volvo duo prop with F3's. I cruise at 3,000 rpms at about 21 to 22 knots. I have a 300l tank (I believe) and I burn about 5 to 6 gallons per hour. I can bash through pretty much anything at that rate, and it will top out at 37 knots at 4,700 rpm or a tank an hour or so lol...its a pretty efficient hull and I get it onto plane with the drive full down then add a bit of tab and trim it back up with the drive as need be.
 
Silver Streak Gambier 18.6 Hardtop with bulkhead. 21ft OAL - Mercury 150 hp four stroke - 14.5 X 17P 4 blade stainless prop
Best cruise at 24-26 mph/4.3 - 4.5 mpg
WOT at 42 mph/2.5 mpg
 
pescador said:
Anybody know if new motors get poorer gas mileage then they improve over time? My new Yam F250 seems to be using more fuel that the 16 year old f225 I had.
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Update-so I’ve finally got things dialled in. I installed a NMEA network this week to my 2019 F250 Yam. The package includes fuel burn among other data. I’ve been testing and after running the motor now 45 hours have figured out it requires far less rpm to get on plane than my old 2003 F225 Yam. The old motor really needed 4200 rpm to cruise at 27-29 mph and to stay on plane. The new motor will get on step and stay there at 3700 rpm comfortable doing the same speed. The big difference is fuel burn. I’m burning 8.9 gph with the new motor versus roughly 12 with the old. If I take the new motor to 4200 rpm the fuel burn is exactly 12 gph like the old one, but higher speed (35). The amazing thing about having the fuel burn telemetry is to watch the fuel burn at 5500 rpm/ 45 mph. It’s 22 gph!! I’m using the same 3 blade stainless prop. Amazing performance and a savings of $1000 a year in fuel over the old motor if I manage the rpm. In about 20 years it’ll have paid for itself!!
 
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