1990 38 convertable fuel economy

[Zultan]

I'm interested in buying a 1990 38 convertable with twin detroit 425hp 671T's in it.Can anyone tell me the expected liters/gal per hour i could expect from this boat and anything else that i should be aware of.
Thanks

[Martuni]

I have a 2002 40 Open with Yanmar 465 HP engines. She burns around 1.5 gallons per mile at 26 knots. (That is total).

[captjohn]

is that total or per side??????

[Douglas Fairchild]

D&D's are two strokes. Compared to four strokes they are considered fuel hogs. You cannot compare D&D to a Yanmar 4 stroke. How many hours are on engines. At 425 horse, rebuilds are much more frequent due to added stress on engine. I believe the Max horsepower from D&D was 400. Aftermarket upped horsepower which is easy to do with two strokes. Doug

[Mazlin]

Martuni,what sort of revs are you doing to see that speed?
My 40 convertible 450c cummins uses 75-80 litres an hour @ 18knots and 2050 rpm.This is in real offshore conditions.

[Martuni]

I am turning 2400 to 2450 rpm at that speed and the fuel consumption is total both engines. Thanks for pointing that clarification out Capt John.