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Old 09-04-2010, 02:13 PM   #1
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Fuel consumption

How many gallons can I expect to burn with chrysler 318 ( twin) in a 36 ft cruiser at 8-10 knots. Does anyone know about "Grenfell Design" Thanks Guys
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Old 09-04-2010, 09:02 PM   #2
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RE: Fuel consumption

Many years ago I had a 36' boat with twin 383s. It burned about 4 gph per engiine at 1800 RPM. On a plane (20mph) at 3400 it used about*12 gph per engine.
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Old 09-04-2010, 11:22 PM   #3
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RE: Fuel consumption

I was gonna say you will get about 2mpg........
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Old 09-12-2010, 07:37 PM   #4
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RE: Fuel consumption

Thanks..Did you ever just run 1 motor at 1800. Was it enough to run @ 8 knots with your twin screw?
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Old 09-12-2010, 09:56 PM   #5
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RE: Fuel consumption

No, I never did it. Gas was a whopping 60 cents per gallon so big cost items were elsewhere. I'm not a fan of one engine at a time due to*prop rotation issues on other engine. But, different strokes ---
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