Thread: Diesel Economy
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Old 08-30-2015, 02:24 PM   #17
BandB
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City: Fort Lauderdale
Country: USA
Join Date: Jan 2014
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Well here is one comparison on Sea Rays. Comparing 2x380 Mercruisers in a Sundancer 370 to 2x380 Cummins in a Sundancer 450. I'll keep looking for something in identical boats.

Test Power: 2 x 380-hp MerCruiser 8.2 MAG DTS with Axius
Range
RPM MPH Knots GPH MPG NMPG Stat. Naut
660 4.1 3.6 2.5 1.6 1.4 334 290
1000 5.9 5.1 3.7 1.6 1.4 326 283
1500 8.2 7.1 5.6 1.3 1.1 255 222
2000 10.0 8.7 10.7 0.9 0.8 189 164
2500 12.0 10.4 17.2 0.7 0.6 142 123
3000 18.0 15.6 24.2 0.7 0.7 151 131
3500 27.3 23.7 27.8 1.0 0.8 200 174
4000 34.1 30.5 40.0 0.9 0.8 178 155
4500 40.7 35.4 51.0 0.8 0.7 162 141
4800 43.8 38.0 64.8 0.7 0.6 137 120

Test Power: 2 x 380-hp Cummins QSB5.9
Range
RPM MPH Knots GPH MPG NMPG Stat. NM
600 5.0 4.3 1.2 4.2 3.6 1095 952
1000 8.6 7.5 3.2 2.7 2.3 706 614
1500 10.5 9.1 9.4 1.1 1.0 292 254
2000 16.3 14.2 21.5 0.8 0.7 199 173
2300 21.7 18.9 26.8 0.8 0.7 213 185
2500 25.9 22.5 27.8 0.9 0.8 244 212
2800 32.5 28.2 35.5 0.9 0.8 240 209
3000 35.9 31.2 39.4 0.9 0.8 239 208
3040 36.8 32.0 40.3 0.9 0.8 240 209
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