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Perkins diesel fuel milage per hour etc.
I've a Perkins 4-108, a little smaller than the Perkins 4-236 and it burns about 1/2 gallon per hour @ 1900RPM, 3/4 gallon per hour @ 2100RPM, and 1 Gallon per hour @ 2500RPM.
The boat is an Irwin, 37ft LOA with a 31ft LWL, and 20,000 lbs.
The boat is in charter service and with all the charterers using the boat these are the averages so the Perkins 4-236 might burn a little more.
I've worked on the Perkins 4-236 and it's a good reliable engine.