Whaler Central - Boston Whaler Boat Information and Photos

Posted by rkmnoles on 02/20/12 - 5:03 PM

I have completed the engine change on my 83 17 ft montauk with a Yamaha 90 hp 4 stk. Can anyone that has this set up give me an approx. fuel consumption rate in MPG. I am looking at putting a 15 gal tank in it and I am just curious. Thanks, Kevin

Posted by Joe Kriz on 02/20/12 - 5:08 PM

I think you might be dreaming here with any kind of 90 HP....

I would put two 12 gallon tanks just like original. If you don't want to fill one up, then you have that option.

Posted by Guts on 02/21/12 - 4:54 AM

I think it depends on a lot of factors. Whether you're just trolling or waterskiing. How many hours you are the running the boat and at what speed. I use a 24 gallon tank.

Posted by tedious on 02/21/12 - 4:59 AM

Kevin, you can get some idea of mileage from Yamaha's performance bulletins. From looking at a few of them on boats that are fairly similar in weight to your Montauk, I'd guess you're going to get 9 MPG at troll, 6 MPG at cruise, and about 4 MPG at WOT.

If you're replacing a 2-stroke, the mileage at troll should be a ton better, the cruise somewhat better, and the WOT just a little better. Whether you can cut your fuel storage almost in half will depend on how much time you spend in each of those modes, but I agree with the others; get the 26 gallon that's made for the Montauk! You may not need to fill it all the time, but why not give yourself that option?

Tim

Posted by rkmnoles on 02/22/12 - 7:23 PM

Thanks for the input. I was thinking the 15 gal. may ease the weight difference between the 2stk and the 4 stk. I fish mostly within 10 miles of fuel and I am more of a cruiser than a WOT guy.

Posted by Karlow on 02/22/12 - 8:06 PM

I have a little feed back from my 17 with the DF70.
I trolled at 1.6-2.2 knots (troll brake) for 6 hours last Sat. I previous spent about 4 hour trolling and a little bit of running around w/o trolling at another lake. That burned just under 5 gal.
I don not any more time on the water with this rig.

Posted by wrangler on 02/23/12 - 4:41 AM

1979 Montauk with T top Yamaha 90 HP 4 stroke. Depending on whether I am going with the tide or not and with 2 people on board I get 5-6 miles per gallon. That is running 4000 RPM with a speed of 20 MPH and only slowing for no wake zones. I have a 26 gallon fuel tank.