Fuel usage?

[Groucho]

When it shows on the smartcraft or other gauge... GPH. If you have twins is this reading per engine?

I have a hard time understanding that 2 engines only use a little more fuel than a single. I know the twins work easier than a single...but also think fuel flow for 2000 rpm should be close to the same if you have 1 engine or 2 or 3.

Thoughts?

 

[Groucho]

:huh:

 

[Nacho Boat]

When it shows on the smartcraft or other gauge... GPH. If you have twins is this reading per engine?

I have a hard time understanding that 2 engines only use a little more fuel than a single. I know the twins work easier than a single...but also think fuel flow for 2000 rpm should be close to the same if you have 1 engine or 2 or 3.

Thoughts?

With twin engines, you have multiple Smart Craft outputs. First, you have a gauge dedicated to each engine, which reports the GPH for that specific engine (so you can see if each engine is burning about the same). Plus, with twin engine, your center gauqe gives you several "total" readings. I don't recall that I get a GPH readout on that gauge (I do get that read-out on my Northstar GPS with the Smartcraft interface), but I do recall that you get an average and instaneous MPG readout. The only problem I have with the MPG readout is that my speedometer is rarely accurate, so the MPG is not very accurate.

I don't believe that you are going to see a great fuel economy savings in one engine vs two for the same size boat. Regardless of how many engines you have, you will still need "about" the same amount of power to push your boat through the water (minus the weight savings you have with a one engine boat). So, basically one engine is either working very hard, or two engines are working closer to mid-range. I believe you have a large block single engine, and would expect that you get about 20-30% better fuel economy than I get with 5.0L's.

On a good day, I can get about 1.5 MPG cruising with my boat -- How does that compare with yours?

 

[Groucho]

Thanks for your reply...Most of my cruising is around 7 mph. So.....I haven't really noticed my economy #'s....But I'll write a few readings down this weekend. It seems our #'s might be pretty close though.

 

[Nehalennia]

Thanks for your reply...Most of my cruising is around 7 mph.........

7? That can't be