Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home› Fuel consumption›20–25 kW Bi-Fuel (NG/LP)

20–25 kW Bi-Fuel (NG/LP) Generator Fuel Consumption

Manufacturer-documented fuel consumption for 34 20–25 kW Bi-Fuel (NG/LP) generator sets — median 3.51 gal/h at full load, 2.36 gal/h at half load.

Compare 20–25 kW Bi-Fuel (NG/LP) generator specs side-by-side →

Consumption by model

34
ModelkWgal/h @ 50%gal/h @ 100% Tank (L)Runtime @ 50% (h)
Briggs & Stratton PP20202.303.70——
Cummins/Onan RS20A201.453.01——
Generac 7038200.871.37——
Generac G007038202.363.56——
Generac G007038-0 or G007039-0202.522.94——
Generac G007039202.363.56——
Generac G007040-0201.793.46——
Generac G007041-0201.793.46——
Generac G007077-0202.393.56——
Generac G007077-1202.393.56——
Generac Guardian 20 kW202.373.56——
Generac QT020200.791.13——
Kohler 20RCA201.222.11——
Kohler 20RES200.480.61158.3
Cummins/Onan RS 22222.003.10——
Generac 7042220.260.39——
Generac G007042222.363.56——
Generac G007042-0 or G007043-0222.522.94——
Generac G007043222.363.56——
Generac Guardian 22 kW222.373.56——
Generac In Line 42226.4267.36——
Generac QT022221.813.29——
Generac QT0222422—0.90——
Generac RG022220.550.90——
FG Wilson UHG24E1S241.197.5040590.0
FG Wilson UHG30E124—2.50——
Generac 7209240.260.39——
Generac G007209-0242.363.56——
Generac G007209-10242.363.56——
Generac G007210-1242.363.56——
Generac G007210-10242.363.56——
Generac Guardian 24 kW242.373.56——
Kohler 24RCL241.802.39——
Kohler 26RCA245.108.20——

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.

Common questions

How much fuel does a 20–25 kW Bi-Fuel (NG/LP) generator use?

Across 34 models with manufacturer data, full-load consumption runs 0.39–67.36 gal/h (median 3.51); at 50% load the median is 2.36 gal/h.

How long will a 20–25 kW Bi-Fuel (NG/LP) generator run on a full tank?

At 50% load, documented tank sizes give 8.3–90.0 hours (median 49.2 h) across 2 models.