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#1
04-14-2009, 10:54 AM
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Best possible gas mileage... ????
I have plans for a couple of long trips this summer, one of them over 100 miles away, I started asking myself what is my boat`s most fuel efficient speed, and I don`t have an answer. I guess the slowest planing speed will be the best, due to the least achievable drag from water/wind, but that is just a guess.
Has anybody ever figured this one out on a V20 ?
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Make the habit of radio-checking your VHF, and use it. Father God is too busy to come down to help you himself, He sends His Angels. They have no wings, They are just your true friends. 
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#2
04-14-2009, 11:43 AM
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you can pick up a flowscan type meter from lowrance for about 125.00 and then with a gps you can do the math easily. my best guess would be about 2-3 mph at best
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#3
04-14-2009, 12:18 PM
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Captain Jon
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#4
04-14-2009, 12:27 PM
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#5
04-14-2009, 03:29 PM
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The most fuel efficient speed will not necessarily be the slowest planing speed.
One of those fuel flow meters and a GPS is about the only way to get it real close and not necessarily will the least fuel consumption be the most fuel efficient. The top numbers is gallons of fuel used per hour, the left side numbers is the speed of the boat, all the other numbers in the chart are miles per gallon.  And I haven't taken the time to check all of this on my boat yet. So I have no idea what the best speed or rpm is to be the most efficient.
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 '75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny Last edited by tsubaki; 04-14-2009 at 03:42 PM.
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#6
04-14-2009, 05:09 PM
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Without a flow meter, the most economical RPM to run is normally around 3600-4000 if your propped to spin up to the high side on your WOT RPM's. A fuel flow meter is the best way to figure it out though. My boat gets about 2 NMPG from 3500-4300, the fuel consumption and speed both go up proportionaltly to each other. At 4300 the fuel burn begins to go up faster than the speed, and at 5400 they come back and almost match each other again. I can get right at 1.8-2 NMPG running flat out on mine, but it isn't very forgiving when you hit a wave at 50.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#7
04-14-2009, 06:46 PM
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What kind of eng do you have ( I may have missed that?)
I have a 5.7 V/8 on my V 20 cuddy with a 4 barrell carb and I average 3.5+ mph at 3000rpm @ 30mph. That equals out to a 60gal gas tank at 3.5miles per gal = 210 miles. 
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Tis better to be quiet and thought a fool than open your mouth and prove it!! 1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson  
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#8
04-14-2009, 07:06 PM
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3750-4100 RPM's will probably be your best. I am getting 3.5 mpg at that range of RPM's. Get a floscan and if you can afford it get one that automatically does the gph to mpg conversion (NMEA from GPS) so you can have instant readings. I just got the GFS10 from Garmin to integrate with my GPS440S and absolutely love it.
-Svence
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1984 V-20 Steplift 1998 Johnson 175
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#9
04-14-2009, 08:23 PM
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#10
04-15-2009, 12:22 AM
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my cuddy had a 175 yamaha got 2 1/2 mpg at about 4500 rpm, 60 gal gas = 150 miles
Remeber the rule 1/3 to go 1/3 to come back and 1/3 for reserve and you will be fine. If you go 100 miles will you have a gas statioin some were along the line??
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1986 V20 Old Fishermen never die, we just SMELL that way!!
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