Manufacturer-documented fuel consumption for 60 15–20 kW Diesel generator sets — median 1.24 gal/h at full load, 0.69 gal/h at half load.
Compare 15–20 kW Diesel generator specs side-by-side →
| Model | kW | gal/h @ 50% | gal/h @ 100% | Tank (L) | Runtime @ 50% (h) |
|---|---|---|---|---|---|
| Cummins/Onan 15.0 RDJC | 15 | — | 1.30 | — | — |
| Cummins/Onan DSKAB | 15 | 0.61 | 1.24 | — | — |
| Cummins/Onan MDL3 | 15 | 0.61 | 1.11 | — | — |
| Cummins/Onan RDJC 15 | 15 | — | 1.32 | — | — |
| Generac RA01522 | 15 | 0.85 | 1.37 | 204 | 63.8 |
| Generac RD015 | 15 | 0.22 | 0.39 | 127 | 149.4 |
| Generac SD015 | 15 | 0.71 | 1.48 | — | — |
| Generac SDC015 | 15 | 1.02 | 1.61 | 204 | 52.8 |
| Isuzu MLT 5200 | 15 | — | 1.30 | 212 | — |
| Kohler 15EOZD | 15 | 0.95 | 1.32 | — | — |
| Kohler 15REOZD | 15 | — | 0.13 | 152 | — |
| Kohler 15ROY | 15 | 0.26 | 0.50 | — | — |
| Mitsubishi MLT 5150 | 15 | — | 1.30 | 212 | — |
| Perkins FPE 15 M | 15 | 0.55 | 0.98 | 473 | 225.2 |
| SDMO Pacific | 15 | — | 0.45 | 50 | — |
| Stadco CP15 | 15 | 0.40 | 0.80 | — | — |
| Wildcat Renegade Diesel 15KW | 15 | 0.39 | 0.70 | — | — |
| Wildcat Power Gen Freedom Diesel 15KW | 15 | 0.39 | 0.70 | — | — |
| Kubota J313 | 15 | — | 0.71 | 79 | — |
| Caterpillar DE22E3 | 16 | 0.82 | 1.53 | 66 | 21.3 |
| Cummins/Onan MDKAE 16 | 16 | — | 1.29 | — | — |
| Emsa E BD XX 0020 | 16 | 0.69 | 1.24 | 82 | 31.5 |
| Kohler 16EKOZD | 16 | 0.53 | 1.03 | — | — |
| Kubota SQ-3300 | 16 | 0.61 | 1.40 | 79 | 34.3 |
| Northern Lights M20C | 16 | — | 1.23 | — | — |
| Northern Lights M844DW3 | 16 | 1.03 | 0.13 | — | — |
| Northern Lights M844L | 16 | 0.82 | 1.23 | — | — |
| Northern Lights M844W2 | 16 | 0.62 | 1.05 | — | — |
| Northern Lights ML844L | 16 | — | 1.23 | — | — |
| Northern Lights NL844 | 16 | 0.85 | 1.23 | — | — |
| SDMO T 20 HK | 16 | — | 0.45 | 50 | — |
| SDMO T16UC | 16 | — | 1.11 | 18 | — |
| SDMO TM16UC | 16 | 0.87 | 1.40 | 18 | 5.5 |
| Lister Petter HSL 24 | 16 | — | 0.40 | 66 | — |
| Kohler 16.5EFKOZD | 16 | 0.69 | 1.31 | — | — |
| FG Wilson P16.5E2S | 16 | — | 1.35 | 45 | — |
| Kohler 16.5EFORD | 16 | 0.82 | 1.48 | — | — |
| Kohler 16.5EFORZD | 16 | 0.82 | 1.48 | — | — |
| Genmac HSD21 | 17 | — | 0.29 | 23 | — |
| Kohler 17EFKOZD | 17 | 0.69 | 1.31 | — | — |
| Kohler 17EFOZD | 17 | 0.71 | 1.24 | — | — |
| FG Wilson PH17.5E2S | 18 | — | 1.85 | 45 | — |
| Kohler 17.5EFKOZD | 18 | 0.69 | 1.31 | — | — |
| Kohler 17.5EFOZD | 18 | 0.71 | 1.24 | — | — |
| Yanmar HYW-20 M6 | 18 | 1.03 | 1.72 | — | — |
| FG Wilson L22E1 | 18 | — | 1.32 | 45 | — |
| FG Wilson P22E2 | 18 | — | 1.43 | 45 | — |
| FG Wilson PH22E2 | 18 | — | 1.88 | 45 | — |
| Kubota J 310 | 18 | 0.61 | 1.40 | 79 | 34.3 |
| SDMO T 22 K | 18 | — | 0.45 | 100 | — |
| Perkins 404A-22G1 | 18 | 0.77 | 1.06 | — | — |
| Perkins 404D-22 | 18 | 0.77 | 1.06 | 3 | 1.1 |
| Lister Petter LLD 200 | 18 | — | 0.50 | 66 | — |
| Kohler 18EFKOZD | 18 | 0.69 | 1.31 | — | — |
| SDMO R22 | 18 | — | 0.90 | — | — |
| Generac MLT4150MV | 18 | — | 0.59 | 216 | — |
| Mitsubishi MLG 15 | 18 | — | 1.30 | — | — |
| Cummins/Onan 19HDKBV | 19 | — | 1.74 | — | — |
| Simson-Maxwell SKW20 T6-T4 | 19 | — | 1.59 | 158 | — |
| Kubota j324 | 19 | — | 0.71 | 79 | — |
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 60 models with manufacturer data, full-load consumption runs 0.13–1.88 gal/h (median 1.24); at 50% load the median is 0.69 gal/h.
At 50% load, documented tank sizes give 1.1–225.2 hours (median 34.3 h) across 10 models.