Cummins 4BT3.9M Fuel Consumption Measurements

So how much fuel does a 150hp Cummins 4BT-3.9M use? The following data was compiled in calm conditions, aboard Nellie D. #63 on the Caloosahatchee Canal west of Lake Okeechobee, Florida. RPM readings came from the helm's VDO tachometer, ground speed came from a Garmin GPS and fuel flow rates came from a Flowscan.

RPM	Knots	GPH
600	3.3	.2
700	3.5	.3
800	3.6	.4
900	4.2	.5
1000	4.7	.6
1200	5.5	.9
1300	5.8	1.0
1400	6.1	1.2
1500	6.4	1.4
1600	6.7	1.6
1700	6.8	1.7
1800	7.2	1.9
1900	7.5	2.4
2000	7.7	2.8
2100	7.8	3.1
2200	8.0	3.6
2300	8.3	4.3
2400	8.4	5.1