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  MPG on '05 Montauk, 90 4-stroke

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Author Topic:   MPG on '05 Montauk, 90 4-stroke
pvonk posted 05-09-2005 08:19 PM ET (US)   Profile for pvonk   Send Email to pvonk  
Although I kept a log of the boat's first year (only about 1.5 months) in the water, I didn't keep good records (using GPS and instruments) all the time. One thing I'd like to know is the expected mpg. I rarely go WOT but let's say going up to 3800 rmp off and on, what would I expect in mpg?

I'll be boating on a lake this year, about 29 miles long. Can I make it from one end and back using the original twin 6.5 gal tanks?

I did buy an additional low profile, 6 gal. Tempo tank to fit under the stern seat. I can do a switch with the tanks under the pilot seat if needed. But I'm just curious how far I can expect to go with the twin tanks. (My boat is still in winter storage, on the Cape of Cod, as "Radar" said - M.A.S.H, in case you forgot, and it won't be trailered to the lake in upstate NY until mid June. I've got boat fever - the mind asks all kinds of quesions at this point!)


- Pierre

Maximus posted 05-09-2005 10:39 PM ET (US)     Profile for Maximus  Send Email to Maximus     
I've gotten a pretty consistent 4.25 mpg under mixed usage, calculated from GPS and fuel consumption upon refill of the tanks.
Matthew posted 05-10-2005 12:27 AM ET (US)     Profile for Matthew  Send Email to Matthew     
Hi Pierre,

As a point of reference, my 2002 90 2 stroke on the same hull covered 61 miles (gps) using between 12 and 13 gallons. You should do better than that.

The Dragonfly graphics in your photo album look great.

I would be interested in seeing an interior shot of your stern seat along with the dimensions.

pvonk posted 05-10-2005 09:52 AM ET (US)     Profile for pvonk  Send Email to pvonk     
I've just ordered a new digital camera and hope to take more pics of Dragonfly when I'm on the Cape to retrieve her (will spend a few weeks there). I'll be sure to take more interior shots, especially the stern seat. Probably won't be complete until early July.

- Pierre

WT posted 05-10-2005 01:09 PM ET (US)     Profile for WT  Send Email to WT     
I've only check my mileage once. I have a 2004 Montauk with a 90 hp 4 stroke. A 50 mile round trip in the ocean used 12 gallons of fuel.

You should get around 5-6 mpg at around 3500 rpm in a calm lake. Look at the mpg for an optimax:


Moe posted 05-10-2005 01:29 PM ET (US)     Profile for Moe  Send Email to Moe     
I graphed a magazine test once for Barney:

Don't know how heavily the boat was loaded.

Keep in mind the 6.6 gallon tanks should only be filled with 6 gallons to allow for expansion. If you fill 'em full, the gasket around the outlet will probably start seeping.

So the answer is yes, you should probably make it 30 miles out and back if all goes well... however, you'll be violating the 1/3 rule... 1/3 out, 1/3 back, and 1/3 reserve. You'll have little to no reserve.

Moe posted 05-10-2005 01:30 PM ET (US)     Profile for Moe  Send Email to Moe     
Oops... just noticed the 6 gallon tank under the stern seat. Ignore the last comment about reserve. Sorry.

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