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Author Topic:   BW 15 mpg
Ron Brassord posted 03-18-2002 01:01 AM ET (US)   Profile for Ron Brassord   Send Email to Ron Brassord  
Renovation of our newly acqired BW 15 is nearly complete and ready for launch. The boat came with the basic 6 gallon gas tank, and I am considering a larger semi-permanent tank, but wonder what I can expect for fuel burn. The engine is a mid 90's 70 hp Johnson, and I will be taking longish trips with two adults and maybe 100 pounds of gear.I got a report the boat will do 40, but will probably seldom exceed 20 cruising. I know there are many variables, but wonder what the ballpark mpg might be?
Ron B Lighthouse Pt Fl
Drisney posted 03-18-2002 01:21 AM ET (US)     Profile for Drisney  Send Email to Drisney     
Ballpark would be 2 to 2.5 mpg
Clark Roberts posted 03-18-2002 07:53 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Ron, the 15 is a very efficient hull when trimed out and if that 3 cyl OMC is fitted with the correct prop, installed at proper height (I like anti-cav plate about 1 1/2 above hull bottom), in good tune, and cruised at 4K rpm or below, will produce some very good mpg figures. The best mileage I have ever gotten with a 15 and 70 OMC was a 78 Sport with 78 Evinrude 70 which got around 5 or 6 mpg at cruise. It was a great set-up and would hit 43mph if my memory serves me correctly. Back then we didn't have GPS for accurate speeds and used measured course and stop watch..etc... also we clocked speed with a car/truck alongside where possible.. Best advice from me is to make some runs of known distance at varying speeds and keep acurate track of fuel used... then calculate the mpg and you will be dialed in for your particular rig and the way you use it! I love 15's...well, I love 'em all! Happy Whalin'.. Clark.. Spruce Creek Navy
Ron Brassord posted 03-18-2002 08:24 AM ET (US)     Profile for Ron Brassord  Send Email to Ron Brassord     
Clarke Your testimonial on the BW 15 is most appreciated. Our first Whaler experiance was over thirty years ago when we provided our 13 year old son with a 13 to use in the Conn River. Now the grandsons are whaler age and a the 15 is a blatant bribe to get them to visit us in Florida, and it works. Our first 13 cost $1450 for a 13 with a 40 johnson and trailer[all new] Our 15 [used but good] cost many times that, but the fun is unchanged.This forum has added greatly to the process.
I have only the bottom to paint and in she goes.
Thanks again. I now feel that with two 6 gallon tanks I will have plenty of range.
Ron Brassord lighthouse Pt Fl
jameso posted 03-18-2002 08:37 AM ET (US)     Profile for jameso  Send Email to jameso     
Clark is right on. I have a 15 with a 50 OMC mid 80's. 5/6 MPG is par. A note as to your statement about 20 MPH usually. The 15 is barely on plane at 20, I find the best cruise speed for MPG and sightseeing closer to 24/26, get enough speed to keep from mushing in and maintain good control.
Enjoy the 15, sweet rig.
Jim Armstrong
Ron Brassord posted 03-18-2002 05:16 PM ET (US)     Profile for Ron Brassord  Send Email to Ron Brassord     
You fellows make me feel pretty good about this 15 Whaler. The predicted performance is more than I had hoped for.
I just finished the first coat on the bottom, and one more and I can launch. The waterline came out perfect using my garage floor as a base. Sitting on the trailer, I found bow and stern points and then adjusted them all even. A 28 inch stick fell on all three points and then worked as a guide for all points in between. The bow was tricky, but it looks great.
Thanks or the help Ron B LHP FL
Jim Bennett posted 03-18-2002 09:17 PM ET (US)     Profile for Jim Bennett  Send Email to Jim Bennett     
Gee Ron,

I thought from the title of this thread that you were going to tell us your secret for getting 15 mpg out of your whaler. I was ready to use your ideas with my 150 powered Outrage. Guess it's just how you read things!! ;-}

Clark Roberts posted 03-19-2002 05:22 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Jim has provided some great info on 15's (and others) in the "Reference" section!
Bigshot posted 03-19-2002 09:49 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Had 3 15's. With a 70 and running at cruise consider 4 GPH. The 50's will do about 3gph. With Grandkids running the snot outa it, you might get 2 hours on those 2 tanks.
where2 posted 03-20-2002 12:28 PM ET (US)     Profile for where2  Send Email to where2     
I ran from my house, 4 miles down to Palm Beach Inlet, out the inlet, down to the Breakers Hotel, and back the same route to the house on the weekend, without swapping off the first 6 gallon tank. Throttle range varied from 1400rpm idle, to WOT, with the ocean portion running anywhere from 15mph to 29mph. A quick plot of the route on Garmin's Mapsource says 26.4 miles, on less than 6 gallons of gas. Of the whole trip, only 8 miles was idle. 15' Sport, 1985 70Hp Johnson with a 13-1/4"x19" prop, and one body in the boat. Started with 12 gallons of gas, ended with between 6 and 8 gallons left.
My usual calculation for a half day of waterskiing is 6 gallons of gas.
fireball posted 03-20-2002 05:53 PM ET (US)     Profile for fireball  Send Email to fireball     
Bigshot-it must be the gas you are buying for this fabulous mileage-where can I get some. g
Bigshot posted 03-21-2002 10:09 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
1st you need a 15' Whaler.

I personally do not consider 4 gph fantastic when we are dealing with a 15' boat. My 17' burns considerably less with the 70hp 4 stroke.

Make that unbelievably less!

I bet that 15' with a 60 Yamaha or merc 4 stroke would be allergic to fuel.

I ran my 70 with 3 gals of gas at cruise(3700rpm+/-) and it took about 42 mins to run dry. Hence she will roughly burn 4gph. I have no clue as to how far in miles that was.

mudpuppy posted 03-21-2002 06:26 PM ET (US)     Profile for mudpuppy  Send Email to mudpuppy     
I'm running a 15 Super Sport Classic with a 60 hp merc with 2 or 3 people aboard plus a Labrador or two, and we were swapping lines to the second 6 gal tank after about 3-4 hours fishing a drift pattern at low RPMs. I recently tired of this, and installed an 18 gal Tempo tank that fits nicely under the seat with plenty of room to spare. It is a major improvement.
Alan Hiccock posted 03-21-2002 07:42 PM ET (US)     Profile for Alan Hiccock  Send Email to Alan Hiccock     
Ive got a 15 sport with a 70 Yammie,'01 low hre.
I just put her in 2 weeks ago, put 13 hrs. on her allready { prettyn hard to do mid March off long Island, Ive had many boats and really love this my first Whaler, Yamaha too BUT.. If I had one complaint she uses a little more then I expected. I think I was doing the same gas milage in my V19 Carolina Skiff CC w/a 90 johnson. but then again I doo like to go fast .
Oh also Ron Brassord,
Your rig will do more then 40 unless the engines tired or it's not propped right. Figure on an honest 45+, Oh and gas milage taking it easy with just a little WOT is about 3.5 - 4 gph's.
Ive headr/read of 19's with 150 hp { 2 strokes} that do better,
go figure?
WWonderful posted 03-21-2002 11:27 PM ET (US)     Profile for WWonderful  Send Email to WWonderful     
Yooo Mud Puppy you mentioned you have a 15SS and you put a 18 gallon tank under the seat. The question is, there is only 4-5" under the seat what physical size tank did you use? I just bought my 15ss and presently refinishing the seats.I,ve got an open question what HP motor I need. I found a 45HP Honda 1994 or buy a 2002 Mercury 40-60 hp. The front hatch cover needs replacement and I would like to know what is the best material to use.(Starboard, Mahogony Ply or a new material called skid board) Warren
jimh posted 03-22-2002 08:41 AM ET (US)     Profile for jimh  Send Email to jimh     
When someone says they have a tank that fits under the thwart seat on a Whaler, you have to check on the style of thwart seat they refer to.

Originally the thwart seats were made to sit on the molded lip of the cockpit liner shell, and the wooden riser board was notched to fit over the thwart. Later, probably in response to customer complaints about the low seating, the thwart seat was made just a bit longer and placed on top of the risers. This raised the seat about three inches.

Thus a tank might fit under the thwart of one Whaler, but be several inches too tall for another. It depends on the seat style.

I have been thinking about changing my 15-SPORT to the higher seating, but the existing seat is just a bit short when set on top of the riser.

If you look at you can see the two style of seat mounting.

Bigshot posted 03-22-2002 09:57 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     

I had a 1979 sport, 1983 center console and a 1988 supersport 15's. They all had the seat on top of the side wood. The pate tank you show I had one on my 79. It was 15gallons I think. I could always do 12 but never 18, it was a weird size.

WWonderful. Post your questions, one by one in their respective forums here and you will get better responses.

Bigshot posted 03-22-2002 10:11 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Actually the Supersport might have had a lower seat than the others. That rear storage is a joke but that full railing was the best. Funny how they all have different traits, some better than others.

If it were up to me I would take a 15 and put like a newport console on it. The factory one was about 6 inches too low to really stand up in, gave you a back ache. then it would have the SS railing because it give evryone something to hold on to but yet not too high and not as goofy looking as the bow rail. my sport and the CC had the wrap around rear railings which were nice. The sport was sans front rail which was stealth. The CC had the rail and it was great for the wife(getting in & out) but personally I thought it looked funny and obstructed my vision and casting, etc. So to wrap up this gas milage thing.....15' with 70hp, pate 15 gallon tank, newport or custom console with seating. No front twart and either the SS rail or no front rail.

Milage results will vary. Altitude, weather and surf conditions along with driver characteristics can give varied results. Continuous full throttle operation will have an adverse effect on your milage. Hull and propeller condition can vary results as well. Drive safely and always wear a lifejacket. Please wear a helmet if you drive like me.

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