Would very much appreciate any fuel consumption figures the Mercury 1350's - if any owner or builder, rigger has any reasonably accurate figures.

Especially at different rpm.

Many thanks

I'm not a rigger by any means but I looked up some info for you till someone else chimes in. A few "tests" show that the engine use approx 120gph at 6200rpm. At a cruise rpm of 4k-4500 you can expect a 25-30% drop in gph getting you around 85-90gph. The following is from the mercury racing site:
"How do I obtain horsepower curves, torque curves, or fuel consumption data?
Horsepower and torque curves are not published because they are considered confidential company information. Fuel consumption data is not published because it is affected by factors beyond our control, such as boat hull type, temperature, humidity, altitude, gear ratios, propeller, etc. In some cases, fuel consumption or other performance data is available from your boat manufacturer for a specific boat/engine combination"

HP divided by 11-12 will give you reasonably close WOT consumption rates on most engines as long as they are properly tuned.

1350/11=123 GPH
1350/12=112 GPH

Griff I don't think that theory works for the 1350's. I've spent quite a bit of time in a 1350 Vee. And all I can say is it burns a freaking bunch of fuel!!

Times that # by two ( for twin engines) Alex..... does that sound more realistic ?

.5#/hr/hp is the rule of thumb.

If I could afford 1350's I would careless about fuel consumption.

one tanker truck per weekend.....how is that for a close estimate?

So 2 gallons a mile? That sounds about right.

you're joking right ?? the engine are way over 100k ea and you are wondering about fuel economy...WTF

Many thanks for the replies

Actually I'm more concerned about tanks sizes and they fit into a boat.

This is for a Marathon racer I'm designing for a client and the fuel capacity and positioning of is a pretty big concern bearing in mind 300nm+ legs

Thanks again