Manufacturer-documented fuel consumption for 20 300–305 kW Diesel generator sets — median 19.88 gal/h at full load, 11.13 gal/h at half load.
Compare 300–305 kW Diesel generator specs side-by-side →
| Model | kW | gal/h @ 50% | gal/h @ 100% | Tank (L) | Runtime @ 50% (h) |
|---|---|---|---|---|---|
| Caterpillar 3406 | 300 | 9.25 | 15.60 | — | — |
| Caterpillar D300 GC | 300 | 24.22 | 42.56 | 2271 | 24.8 |
| Cummins/Onan 300 DFCB | 300 | 2.77 | 3.96 | — | — |
| Cummins/Onan DFCB | 300 | 11.62 | 15.59 | — | — |
| Cummins/Onan DFT Series | 300 | — | 6.71 | — | — |
| Cummins/Onan DHA Series | 300 | — | 24.83 | 94 | — |
| Cummins/Onan DQAF | 300 | — | 17.30 | 1040 | — |
| Cummins/Onan DQBA | 300 | — | 20.42 | — | — |
| Cummins/Onan DQHAB | 300 | 10.66 | 20.66 | — | — |
| Generac MD300 | 300 | 11.60 | 19.89 | 105 | 2.4 |
| Generac SD300 | 300 | 2.93 | 5.26 | 136 | 12.3 |
| Kohler 300EFOZCS | 300 | 10.28 | 20.21 | — | — |
| Kohler 300REOZD | 300 | 7.00 | 13.71 | 2082 | 78.6 |
| Kohler 300REOZDD | 300 | 11.60 | 22.69 | — | — |
| Kohler 300REOZJ | 300 | 13.13 | 22.22 | — | — |
| MTU 6R0150 DS300 | 300 | 1.37 | 2.62 | — | — |
| MTU 6R1600 DS300 | 300 | 13.47 | 21.66 | — | — |
| Simson-Maxwell SVW300 T6-T3 | 300 | 11.91 | 20.00 | 1986 | 44.0 |
| FG Wilson P380E | 304 | — | 18.02 | 610 | — |
| FG Wilson P380E1 | 304 | — | 19.87 | 782 | — |
Figures from each model’s own manufacturer documentation (spec sheets and manuals); runtime = documented tank capacity ÷ consumption at 50% load. Verify against the datasheet for your exact configuration.
Across 20 models with manufacturer data, full-load consumption runs 2.62–42.56 gal/h (median 19.88); at 50% load the median is 11.13 gal/h.
At 50% load, documented tank sizes give 2.4–78.6 hours (median 24.8 h) across 5 models.