8.1 ho Fuel consumption

That seems low. That's my burn rate with twin 4.3's on my 280 @30.
 
Concur with above estimates. 31.5 GPH at 3450 RPM and 28 - 29 mph (full fuel, full water, lots of equip).
 
How does consumption differ between the standard and High Output versions of these engines? In the OP, he used the term "ho" in his subject - is he asking about HO engines?
 
You can expect about 30 gallons per hour at 3500 RPM, 27-28 mph for a normal cruise. AT 3000 RPM, you be around 22 GPH at 18-20 mph, and at WOT you will be at 60 GPH @ 40 mph. If you run at 1400 RPM, you will burn about 5 GPH at 8 mph.

yep! And depending on the year which you did not mention keep those monsters tuned with good plugs, etc.
 
I run ~ 30 GPH total both engines at 30 MPH
 
How does consumption differ between the standard and High Output versions of these engines? In the OP, he used the term "ho" in his subject - is he asking about HO engines?

I don't know about fuel burn in a 340, but HO's do burn a little more, they are cammed slightly different and develope 50 more hp at a couple hundred rpm higher wot than the base 8.1
 
How do I measure the burn at different speeds? I am running a 2002 380 SD with the 8.1 engines.
Thanks,
Ray

I am not sure if the 8.1s in 2002 were setup for Smartcraft but if they were then you could possibly get the GPH used from the engine data. It will be reported per engine.

Two other quick comments - it might be easier to ask a new question with a targeted subject rather than resurrecting and adding to a 10+ year old thread and second I think your designation of "SD" would indicate a Sundeck not a Sundancer which would be "DA".

Nothing meant to offend you only trying to help you get the best responses to your inquiry.

-Kevin
 
0.6-0.7 mpg at planing speeds. I can get up to 1.2-1.3 at cocktail speed.
 
You can get a VesselView link or mobile link added to your boat, the computer will use the GPS speed and the fuel flow rate to give you an accurate MPG, I get about .55-.6 mpg (statute miles) on my 2004 390 Sundancer. I cruise at about 3800 rpm and moving about 25 mph.

Just of note... I don't see any difference in economy whether trimmed bow down or up, or amount of people and fuel on board, it is what it is and it seems to be all the same. The only thing that I see change my MPG's is rough or smooth seas.
 

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