Manufacturer-documented fuel consumption for 45 30–35 kW Diesel generator sets — median 2.59 gal/h at full load, 1.22 gal/h at half load.
Compare 30–35 kW Diesel generator specs side-by-side →
| Model | kW | gal/h @ 50% | gal/h @ 100% | Tank (L) | Runtime @ 50% (h) |
|---|---|---|---|---|---|
| Caterpillar XQ30 | 30 | 1.27 | 2.32 | 291 | 60.6 |
| Caterpillar XQ35 | 30 | 1.14 | 2.30 | 208 | 48.1 |
| Cummins/Onan 30.0 DEH-15R | 30 | — | 2.60 | — | — |
| Cummins/Onan 30.0 DEH-3R | 30 | — | 2.60 | — | — |
| Cummins/Onan 30.0 DEH-9XR | 30 | — | 2.60 | — | — |
| Cummins/Onan 30DGHC | 30 | 10.04 | 16.91 | — | — |
| Cummins/Onan C30 D6 | 30 | 0.97 | 1.81 | 280 | 76.1 |
| Cummins/Onan DEH Series | 30 | — | 0.72 | — | — |
| Cummins/Onan MDL6 | 30 | 0.61 | 1.11 | — | — |
| Generac RA03022 | 30 | 0.85 | 1.37 | 189 | 59.1 |
| Generac RD030 | 30 | 0.22 | 0.39 | 233 | 274.1 |
| Generac SD030 | 30 | 0.98 | 2.75 | 204 | 55.2 |
| Gillette SPD-300-1-1 | 30 | 1.22 | 2.69 | 10 | 2.2 |
| Gillette SPD-300-3-16 | 30 | 1.22 | 2.69 | 10 | 2.2 |
| Gillette SPD-300-3-2 | 30 | 1.22 | 2.69 | 10 | 2.2 |
| Gillette SPD-300-3-3 | 30 | 1.22 | 2.69 | 10 | 2.2 |
| Gillette SPD-300-3-4 | 30 | 1.22 | 2.69 | 10 | 2.2 |
| Gillette SPD-300-3-5 | 30 | 1.22 | 2.69 | 10 | 2.2 |
| Gillette SPD-300-60 HERTZ | 30 | 1.22 | 2.69 | 10 | 2.2 |
| Hipower HJW 30 T6 | 30 | 1.24 | 2.51 | — | — |
| Hipower HRJW 35 T6 | 30 | 1.24 | 2.51 | 100 | 21.3 |
| Kohler 30 REOZK4 | 30 | 1.32 | 2.59 | 293 | 58.6 |
| Kohler 30EORZD | 30 | 1.11 | 2.06 | — | — |
| Kohler 30REOZJ | 30 | 1.27 | 2.19 | — | — |
| Kohler 35 REOZT4 | 30 | 1.32 | 2.59 | 293 | 58.6 |
| MTU 3R0096 DS30 | 30 | 1.29 | 2.40 | — | — |
| MTU MTU 3R0096 DS30 | 30 | 1.37 | 2.62 | — | — |
| Northern Lights M30 | 30 | 0.40 | 2.44 | — | — |
| Northern Lights NL445T1 | 30 | 1.80 | 2.99 | — | — |
| SDMO TM30UC | 30 | 1.59 | 2.59 | 36 | 6.0 |
| Wildcat Roughneck Diesel 30KW | 30 | 1.24 | 2.59 | 265 | 56.6 |
| Yanmar HYW 35 T6 | 31 | 0.38 | 0.68 | 26 | 18.2 |
| Generac MMG35DF4 | 31 | — | 2.06 | 379 | — |
| Perkins 404D-22TAG ElectropaK | 31 | 1.22 | 1.72 | — | — |
| FG Wilson LH40 | 32 | — | 2.91 | 44 | — |
| FG Wilson P35-3S | 32 | 1.69 | 3.43 | 219 | 34.2 |
| FG Wilson P44-1 | 32 | — | 2.38 | 219 | — |
| Kohler 32EKOZD | 32 | 1.29 | 2.56 | — | — |
| Kohler 32EOZ | 32 | 1.11 | 2.06 | — | — |
| Kohler 33EFORZD | 33 | 1.53 | 2.83 | — | — |
| Kohler 33EFOZ | 33 | 1.45 | 2.67 | — | — |
| Perkins 1103A-33 | 33 | 1.03 | 55.77 | — | — |
| Perkins FPE 33 M | 33 | — | 1.90 | 140 | — |
| Cummins/Onan C45D5 | 34 | 2.38 | — | 200 | 22.2 |
| Lister Petter LLD 400 | 35 | — | 0.50 | 66 | — |
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 44 models with manufacturer data, full-load consumption runs 0.39–55.77 gal/h (median 2.59); at 50% load the median is 1.22 gal/h.
At 50% load, documented tank sizes give 2.2–274.1 hours (median 22.2 h) across 21 models.