Manufacturer-documented fuel consumption for 14 35–40 kW Bi-Fuel (NG/LP) generator sets — median 2.10 gal/h at full load, 2.69 gal/h at half load.
Compare 35–40 kW Bi-Fuel (NG/LP) generator specs side-by-side →
| Model | kW | gal/h @ 50% | gal/h @ 100% | Tank (L) | Runtime @ 50% (h) |
|---|---|---|---|---|---|
| Generac G35LG2 | 35 | 31.62 | 58.06 | — | — |
| Generac QT035 | 35 | 3.18 | 6.11 | — | — |
| Generac SG035 | 35 | 108.05 | 180.16 | — | — |
| Cummins/Onan C36 N6 | 36 | 3.20 | 5.10 | — | — |
| Cummins/Onan RX 36 | 36 | — | 6.10 | — | — |
| Generac QT036 | 36 | 2.06 | 3.43 | — | — |
| Generac QT03624 | 36 | — | 0.90 | — | — |
| Generac RG036 | 36 | 0.87 | 1.24 | — | — |
| Generac RG03624ANAX | 36 | — | 2.10 | — | — |
| Generac RG038 | 38 | 0.55 | 0.90 | — | — |
| Generac RG03824ANAX | 38 | — | 2.10 | — | — |
| Kohler 38RCLB | 38 | 0.85 | 1.48 | — | — |
| Cummins/Onan GG series | 39 | — | 0.61 | — | — |
| Kohler 40REZG | 39 | 2.69 | 1.82 | — | — |
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 14 models with manufacturer data, full-load consumption runs 0.61–180.16 gal/h (median 2.10); at 50% load the median is 2.69 gal/h.