Fuel consumption

[rcornejo]

Does anyone know what the mpg is on a 1999 208 adventure is with a 1999 175 2 stroke saltwater series outboard. I know it depends on the user and rpm's but as an average doing 3500-4500 rpm's. Any information would be helpful.

Thanks
Roland Cornejo

 

[seasick]

You would see a burn of about 7 to 12 GPH. The difference between the sweet spot which is about 3800 to 4000 rpm and 4500 is fairly significant. Of course a lot depends on wind, current, drag and propping. If you are making 32 mph at 4500, that works out to 2.5 to 4 mpg ( In theory of course) On my 208 with a 150 Salt Water series, I average a little over 2 nautical miles per gallon in a season. My boating includes a lot of drifting and start/stops.

 

[DB]

GPH

A 175 2 stroke is going to burn around 25 gph at WOT at 4500 somewhere around 19 at 3000 - 4000rpm around 12 - 15 hope this helps

 

[rcornejo]

Thanks for the information. I did not realize that it would use that much fuel. Do anyone know if Grady has that data as they do with the new boats?

 

[seasick]

Re: GPH

A 175 2 stroke is going to burn around 25 gph at WOT at 4500 somewhere around 19 at 3000 - 4000rpm around 12 - 15 hope this helps

Sounds high to me. The 208 is a 3,000 pound hull. But then again, I have been wrong before

 

[rcornejo]

Thanks,

I thought that seemed a little high, I would suspect that you would burn 10 to 12 gallons per hour at 3800 rpm's. Does anyone have better numbers.

Roland

 

[gwwannabe]

DB, my model year 2000 200 HP Johnson only burns 23 GPH at WOT (5800) on my 89 204C Overnighter. I would think his motor should do a fair amount better, like in the 17 - 18 GPH range.

RCORNEJO, I have a Northstar fuel monitor so I have some pretty good numbers for my boat. I think your boat and motor will be a bit more efficient.

At 3500 rpm I'm burning between 8.5 and 10 gph, according to my Northstar fuel flow meter. The variation depends on weight, wind, waves, tide, etc. I average about 2.7 mpg at this rpm range on down to about 2 at wot, about 5800 rpm. Speed is around 26 MPH according to the GPS.

At 4000 RPM I'm seeing about 32 MPH and 2.5 MPG. When I push it to WOT, my Northstar fuel flow meter is registering about 23 GPH and my GPS is registering right around 40 MPH - sometimes a bit below and sometimes a bit over.

Hope this helps.

Gary 93 Gulfstream 89 Overnighter - for sale

 

[rcornejo]

Hi Gwwannabe,

Thanks for the numbers. It really helps to have a machine to help monitor the numbers. That helps me a lot. It is amazing how much fuel you can use/save between 3500 and 5000 RPM's. :!:

Thanks again for your help.

Roland