Quick answer
This page uses a published test for Sea Ray SLX-R 310 with 2 × Mercury 400R. In that table, the best published economy point is around 5.1 kn and 10.2 L/h.
Engine/configuration: 2 × Mercury 400R
Source: manufacturer test
Source: manufacturer test
Published fuel-burn table
| Speed kn | Fuel L/h | L/nm |
|---|---|---|
| 2.4 | 5.7 | 2.33 |
| 5.1 | 10.2 | 1.99 |
| 6.9 | 16.7 | 2.43 |
| 8 | 26.5 | 3.31 |
| 11.1 | 42.4 | 3.81 |
| 15.6 | 55.6 | 3.58 |
| 17.3 | 64.7 | 3.74 |
| 24.2 | 73.1 | 3.01 |
| 32.2 | 90.1 | 2.79 |
| 37.6 | 106.4 | 2.83 |
| 42.5 | 141.6 | 3.33 |
| 47.4 | 188.9 | 3.98 |
| 49.6 | 198.4 | 4 |
Calculate cost per mile
Use the calculator and change the fuel price. If you choose this boat in the picker, SkipperCalc adjusts fuel burn inside the tested speed range.