Manufacturer-documented fuel consumption for 21 125–130 kW Diesel generator sets — median 8.06 gal/h at full load, 4.74 gal/h at half load.
Compare 125–130 kW Diesel generator specs side-by-side →
| Model | kW | gal/h @ 50% | gal/h @ 100% | Tank (L) | Runtime @ 50% (h) |
|---|---|---|---|---|---|
| Airman SDG13-400 | 125 | 4.17 | 6.02 | 250 | 15.8 |
| Caterpillar 3304 | 125 | 4.46 | 6.00 | — | — |
| Caterpillar D125 | 125 | 5.26 | 9.14 | — | — |
| Caterpillar D125 GC | 125 | 8.61 | 14.90 | — | — |
| Cummins/Onan 125 DSGAB | 125 | 10.04 | 2.40 | — | — |
| Cummins/Onan C125 D6C | 125 | 5.60 | 9.30 | — | — |
| Cummins/Onan DGDK | 125 | 5.02 | 0.55 | 60 | 3.2 |
| Cummins/Onan DGEA | 125 | — | 2.91 | — | — |
| Cummins/Onan DGEA 60 Hz Diesel Generator Set | 125 | — | 54.00 | 473 | — |
| Cummins/Onan DSGAB | 125 | — | 3.67 | — | — |
| Kohler 125EFOZ | 125 | 5.05 | 9.54 | — | — |
| Kohler 125EOZ | 125 | 4.20 | 7.29 | — | — |
| Kohler 125ROZJ | 125 | 4.20 | 8.06 | — | — |
| MTU 4R0113 DS125 | 125 | 1.37 | 2.62 | — | — |
| MTU 4R0120 DS125 | 125 | 1.37 | 2.62 | — | — |
| SDMO JS125UC | 125 | 4.36 | 8.43 | — | — |
| Generac MMG150D | 127 | 4.44 | 8.53 | 1295 | 77.1 |
| Magnum MMG150D | 127 | 4.44 | 7.40 | 1295 | 77.1 |
| Simson-Maxwell SDW115 T6-T4 | 127 | 6.87 | 10.49 | — | — |
| Kohler 125REOZJG | 128 | 5.15 | 9.19 | — | — |
| Kohler 125REOZT | 128 | 5.75 | 8.91 | — | — |
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 21 models with manufacturer data, full-load consumption runs 0.55–54.00 gal/h (median 8.06); at 50% load the median is 4.74 gal/h.
At 50% load, documented tank sizes give 3.2–77.1 hours (median 46.4 h) across 4 models.