Manufacturer-documented fuel consumption for 48 40–45 kW Diesel generator sets — median 3.09 gal/h at full load, 1.59 gal/h at half load.
Compare 40–45 kW Diesel generator specs side-by-side →
| Model | kW | gal/h @ 50% | gal/h @ 100% | Tank (L) | Runtime @ 50% (h) |
|---|---|---|---|---|---|
| Aurora Generators AGi40H | 40 | 1.39 | 2.08 | 45 | 8.6 |
| Caps CP50-TP1 | 40 | 1.51 | 2.83 | 160 | 28.1 |
| Caterpillar D40 | 40 | 2.01 | 3.33 | 4 | 0.6 |
| Caterpillar D40 GC | 40 | 8.61 | 14.90 | — | — |
| Cummins/Onan 36 DGBC | 40 | — | 3.38 | 197 | — |
| Cummins/Onan 40 DSFAB | 40 | 10.04 | 2.40 | — | — |
| Cummins/Onan 40.0 DEF-15R50 | 40 | — | 3.51 | — | — |
| Cummins/Onan 40.0 DEF-3R50 | 40 | — | 3.51 | — | — |
| Cummins/Onan 40.0DDB-515R | 40 | — | 1.03 | — | — |
| Cummins/Onan C40 D6 | 40 | — | 2.20 | 200 | — |
| Cummins/Onan DGBC | 40 | — | 2.91 | 24 | — |
| Cummins/Onan DGCA | 40 | — | 2.91 | 24 | — |
| Emsa E BD XX 0050 | 40 | 0.69 | 1.24 | 101 | 38.8 |
| FG Wilson P40 | 40 | 1.35 | 2.77 | 219 | 42.9 |
| FG Wilson P50-1 | 40 | 0.74 | 2.64 | 219 | 78.2 |
| FG Wilson P50-3_50Hz | 40 | 1.48 | 3.09 | 143 | 25.5 |
| FG Wilson P50E1 | 40 | — | 3.14 | 176 | — |
| Generac SD040 | 40 | 1.93 | 3.51 | 211 | 28.9 |
| Kohler 40 REOZK4 | 40 | 1.61 | 3.09 | 293 | 48.0 |
| Kohler 40EFOZ | 40 | 1.64 | 3.04 | — | — |
| Kohler 40EKOZD | 40 | 1.66 | 3.09 | — | — |
| Kohler 40EORZD | 40 | 1.53 | 2.83 | — | — |
| Kohler 40EOZ | 40 | 1.45 | 2.67 | — | — |
| Kohler 40REOZJ | 40 | 1.69 | 2.91 | — | — |
| Kohler 45 REOZT4 | 40 | 1.32 | 3.09 | 293 | 58.6 |
| MQ Power DCA45USIXF | 40 | 1.51 | 0.70 | 751 | 131.8 |
| MTU 4R0113 DS40 | 40 | 1.37 | 2.62 | — | — |
| MTU 4R0113 DS40 SCAQMD | 40 | 1.37 | 2.62 | — | — |
| MTU MTU 4R0113 DS40 | 40 | 1.37 | 2.62 | — | — |
| Northern Lights M40C3F | 40 | 1.60 | 3.26 | — | — |
| Olympian GEP50-7 | 40 | 1.59 | 3.09 | 219 | 36.5 |
| SDMO J40U | 40 | — | 3.46 | — | — |
| SDMO JM40UC | 40 | 1.83 | 3.46 | — | — |
| Simson-Maxwell SDW55 T6-T2 | 40 | 1.77 | 3.22 | 322 | 48.1 |
| Westquip WQ40T4H | 40 | 1.45 | 2.90 | — | — |
| Cummins/Onan 4BTAA3.3-G18 | 42 | 1.59 | 3.17 | — | — |
| Kohler 40REOZK | 42 | 2.01 | 3.49 | — | — |
| Kohler 40REOZT | 42 | 1.61 | 3.22 | — | — |
| Mitsubishi MDG40 | 42 | 1.59 | 3.17 | — | — |
| Caterpillar D60 | 44 | — | 4.94 | — | — |
| Emsa E BD XX 0055 | 44 | 0.69 | 1.24 | 101 | 38.8 |
| FG Wilson P55-1 | 44 | 1.27 | 2.56 | 219 | 45.6 |
| FG Wilson P55-2 | 44 | 1.27 | 3.09 | 219 | 45.6 |
| FG Wilson P55-3 | 44 | 2.01 | 3.62 | 145 | 19.1 |
| Generac MMG45IF4 | 44 | — | 2.06 | 379 | — |
| MTU 4R0113 DS55 | 44 | 1.95 | 3.54 | — | — |
| Olympian GEP55-3 | 44 | 2.01 | 3.59 | 219 | 28.8 |
| Perkins 1104C-44G1 | 44 | 10.30 | 12.42 | — | — |
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 48 models with manufacturer data, full-load consumption runs 0.70–14.90 gal/h (median 3.09); at 50% load the median is 1.59 gal/h.
At 50% load, documented tank sizes give 0.6–131.8 hours (median 38.8 h) across 18 models.