Fuel Consumption
This chart approximates the fuel consumption of a diesel generator based on the size of the generator and the load at which the generator is operating. Please note that this table is intended to be used as an estimate of how much fuel is burned during operation and is not an exact representation due to various factors including generator/engine manufacturer, model, age and load.
Diesel (Gal/hr)
| Generator Size (kW) | 25% Load | 50% Load | 75% Load | 100% Load |
|---|---|---|---|---|
| 20 | .6 | .9 | 1.3 | 1.6 |
| 30 | 1.3 | 1.8 | 2.4 | 2.9 |
| 40 | 1.6 | 2.3 | 3.2 | 4 |
| 60 | 1.8 | 2.9 | 3.8 | 4.8 |
| 75 | 2.4 | 3.4 | 4.6 | 6.1 |
| 100 | 2.6 | 4.1 | 5.8 | 7.4 |
| 125 | 3.1 | 5 | 7.1 | 9.1 |
| 135 | 3.3 | 5.4 | 7.6 | 9.8 |
| 150 | 3.6 | 5.9 | 8.4 | 10.9 |
| 175 | 4.1 | 6.8 | 9.7 | 12.7 |
| 200 | 4.7 | 7.7 | 11 | 14.4 |
| 230 | 5.3 | 8.8 | 12.5 | 16.6 |
| 250 | 5.7 | 9.5 | 13.6 | 18 |
| 300 | 6.8 | 11.3 | 16.1 | 21.5 |
| 350 | 7.9 | 13.1 | 18.7 | 25.1 |
| 400 | 8.9 | 14.9 | 21.3 | 28.6 |
| 500 | 11 | 18.5 | 26.4 | 35.7 |
| 600 | 13.2 | 22 | 31.5 | 42.8 |
| 750 | 16.3 | 27.4 | 39.3 | 53.4 |
| 1000 | 21.6 | 36.4 | 52.1 | 71.1 |
Natural Gas (ft3/hr)
| Generator Size (kW) | 25% Load | 50% Load | 75% Load | 100% Load |
|---|---|---|---|---|
| 20 | 0.6 | 0.9 | 1.3 | 1.6 |
| 100 | 2.6 | 4.1 | 5.8 | 7.4 |
| 250 | 5.7 | 9.5 | 13.6 | 18.0 |
| 500 | 11.0 | 18.5 | 26.4 | 35.7 |
| 1000 | 21.6 | 36.4 | 52.1 | 71.1 |
| 1250 | 26.9 | 45.3 | 65.0 | 88.8 |
| 1500 | 32.2 | 54.3 | 77.8 | 106.5 |
| 1750 | 37.5 | 63.2 | 90.7 | 124.2 |
| 2000 | 42.8 | 72.2 | 103.5 | 141.9 |
| 2250 | 48.1 | 81.1 | 116.4 | 159.6 |
(Natural gas table follows the same kW rows as Diesel from 20–1000 kW, then extends to 2250 kW.)
Propane (Gal/hr)
| Generator Size (kW) | 25% Load | 50% Load | 75% Load | 100% Load |
|---|---|---|---|---|
| 20 | .87 | 1.31 | 1.89 | 2.32 |
| 30 | 1.89 | 2.62 | 2.76 | 4.22 |
| 40 | 2.32 | 3.34 | 4.65 | 5.82 |
| 60 | 2.61 | 4.22 | 5.52 | 6.98 |
| 75 | 2.76 | 4.94 | 6.69 | 8.87 |
| 100 | 3.78 | 5.96 | 8.43 | 10.76 |
| 125 | 4.5 | 7.27 | 10.32 | 13.23 |
| 135 | 4.8 | 7.85 | 11.05 | 14.25 |
| 150 | 5.23 | 8.58 | 12.22 | 15.85 |
| 175 | 5.96 | 9.89 | 14.11 | 18.47 |
| 200 | 6.83 | 11.2 | 16 | 20.94 |
| 230 | 7.7 | 12.8 | 18.18 | 24.14 |
| 250 | 8.29 | 13.81 | 19.78 | 26.18 |
| 300 | 9.89 | 16.53 | 23.41 | 31.26 |
| 350 | 11.49 | 19.04 | 27.19 | 28.93 |
| 400 | 12.94 | 21.62 | 30.99 | 41.59 |
| 500 | 16 | 26.9 | 38.39 | 51.91 |
| 600 | 19.2 | 31.99 | 45.81 | 62.24 |
| 750 | 23.7 | 39.84 | 57.15 | 77.65 |
| 1000 | 31.41 | 52.93 | 75.76 | 103.39 |