Manufacturer-documented fuel consumption for 51 20–25 kW Diesel generator sets — median 1.54 gal/h at full load, 0.82 gal/h at half load.
Compare 20–25 kW Diesel generator specs side-by-side →
| Model | kW | gal/h @ 50% | gal/h @ 100% | Tank (L) | Runtime @ 50% (h) |
|---|---|---|---|---|---|
| Caterpillar XQ20 | 20 | 0.61 | 1.37 | 171 | 74.3 |
| Cummins/Onan C20 D6 | 20 | 0.97 | 1.81 | 174 | 47.3 |
| Cummins/Onan MDKAE | 20 | — | 1.29 | — | — |
| Cummins/Onan MDKAE 20 | 20 | — | 1.29 | — | — |
| Cummins/Onan MDKAF 20 | 20 | — | 1.29 | — | — |
| Cummins/Onan MDL4 | 20 | 0.61 | 1.11 | — | — |
| Emsa E BD XX 0025 | 20 | 0.69 | 1.24 | 82 | 31.5 |
| Generac MLG25 | 20 | 0.90 | 1.80 | 212 | 62.2 |
| Generac MLT4200IF4 | 20 | — | 2.06 | 194 | — |
| Generac RA02022 | 20 | 0.85 | 1.37 | 204 | 63.8 |
| Generac RD020 | 20 | 0.22 | 0.39 | 373 | 438.7 |
| Generac SD020 | 20 | 1.06 | 1.69 | — | — |
| Kohler 20EFOZD | 20 | 0.82 | 1.48 | — | — |
| Kohler 20EKOZD | 20 | 0.69 | 1.31 | — | — |
| Kohler 20EOZD | 20 | 0.71 | 1.24 | — | — |
| Kohler 20REOZD | 20 | — | 0.13 | 152 | — |
| MTU MTU 4R0055 DS20 | 20 | 1.03 | 2.06 | — | — |
| Magnum MLG 20 | 20 | 0.90 | 1.80 | 212 | 62.2 |
| Magnum MLG20ICAN | 20 | — | 1.80 | 212 | — |
| Magnum MLT4200IF4 | 20 | — | 2.06 | 190 | — |
| Magnum MMG25FHI | 20 | 0.90 | 1.80 | 401 | 118.0 |
| Northern Lights M20CRW3 | 20 | 1.03 | 0.13 | — | — |
| Northern Lights M844LW3 | 20 | 0.79 | 0.13 | — | — |
| SDMO J20U | 20 | 1.16 | 2.11 | 100 | 22.7 |
| SDMO MONTANA | 20 | — | 0.45 | 100 | — |
| SDMO T20UC | 20 | 9.51 | 1.95 | — | — |
| SDMO TM20UC | 20 | 1.08 | 1.95 | 36 | 8.8 |
| Stadco CP20 | 20 | 0.40 | 0.80 | — | — |
| Wacker Neuson G 25 | 20 | — | 1.80 | 221 | — |
| Kohler 20.5EFKOZD | 20 | 0.82 | 1.54 | — | — |
| Kubota 4318 | 21 | — | 0.71 | 79 | — |
| Kohler 21EKOZD | 21 | 0.69 | 1.31 | — | — |
| Aurora Generators AGi20P | 21 | 0.82 | 1.13 | 45 | 14.4 |
| Lister Petter GS20DE-LN | 21 | 0.81 | 1.65 | — | — |
| SDMO T 27 HK | 22 | — | 0.45 | 100 | — |
| Kubota SDG13LX-581 | 22 | 0.69 | 0.69 | 100 | 38.5 |
| MQ Power DCA25SSIU2 | 22 | 0.87 | 1.58 | 65 | 19.8 |
| Northern Lights NL844T4E | 22 | 0.79 | 1.72 | — | — |
| Lister Petter GS20DE-LM | 22 | 0.81 | 1.65 | — | — |
| Isuzu ML23IMRD | 23 | 0.22 | 0.45 | — | — |
| Kohler 20REOZT | 23 | 1.08 | 1.90 | — | — |
| Kohler 23EOZD | 23 | 0.82 | 1.48 | — | — |
| Westquip WQ25 | 23 | 1.00 | 1.95 | — | — |
| Aurora Generators AGi24Y-E | 24 | 3.58 | 5.37 | 45 | 3.3 |
| FG Wilson LH 30 | 24 | — | 2.25 | 44 | — |
| FG Wilson P27 | 24 | — | 1.85 | 135 | — |
| FG Wilson P30E | 24 | — | 1.85 | 135 | — |
| FG Wilson PH24E2S | 24 | — | 2.32 | 45 | — |
| Kohler 20REOZK | 24 | 1.00 | 1.88 | — | — |
| Kohler 24EKOZD | 24 | 0.82 | 1.54 | — | — |
| Lister Petter LLD 275 | 25 | — | 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 51 models with manufacturer data, full-load consumption runs 0.13–5.37 gal/h (median 1.54); at 50% load the median is 0.82 gal/h.
At 50% load, documented tank sizes give 3.3–438.7 hours (median 42.9 h) across 14 models.