Manufacturer-documented fuel consumption for 22 10–15 kW Bi-Fuel (NG/LP) generator sets — median 1.48 gal/h at full load, 0.97 gal/h at half load.
Compare 10–15 kW Bi-Fuel (NG/LP) generator specs side-by-side →
| Model | kW | gal/h @ 50% | gal/h @ 100% | Tank (L) | Runtime @ 50% (h) |
|---|---|---|---|---|---|
| Cummins/Onan GHA | 10 | 1.16 | 2.40 | — | — |
| FG Wilson UG11P1S | 10 | 0.48 | 0.69 | — | — |
| Generac 7171 | 10 | 0.26 | 0.39 | — | — |
| Generac G007171-0 | 10 | 0.97 | 1.48 | — | — |
| Generac G007172-0 | 10 | 0.97 | 1.48 | — | — |
| Generac 7031 | 11 | 0.87 | 1.37 | — | — |
| Kohler 12RESV | 11 | 0.90 | 0.55 | — | — |
| FG Wilson UG13E1S | 12 | 0.48 | 0.69 | — | — |
| Briggs & Stratton PP12 | 12 | 1.70 | 2.30 | — | — |
| Kohler 12RES | 12 | — | 0.98 | — | — |
| Briggs & Stratton PP13 | 13 | 1.70 | 2.90 | — | — |
| Cummins/Onan RS13A | 13 | 17.44 | 29.59 | — | — |
| Generac G007173-0 | 13 | 0.97 | 1.48 | — | — |
| Generac G007174-0 | 13 | 0.97 | 1.48 | — | — |
| Generac G007175-0 | 13 | 0.97 | 1.48 | — | — |
| Cummins/Onan GN series | 14 | — | 0.77 | — | — |
| Cummins/Onan RS14AF | 14 | 1.45 | 3.01 | — | — |
| Generac 7223 | 14 | 0.26 | 0.39 | — | — |
| Generac G007223-0 | 14 | 0.97 | 1.48 | — | — |
| Generac G007224-0 | 14 | 0.97 | 1.48 | — | — |
| Generac G007225-0 | 14 | 0.97 | 1.48 | — | — |
| Kohler 14RES | 14 | 0.48 | 0.61 | — | — |
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 22 models with manufacturer data, full-load consumption runs 0.39–29.59 gal/h (median 1.48); at 50% load the median is 0.97 gal/h.