BTU Values for fuels and chemicals Fuel Type BTU's 2 Cycle Oil 138,000 BTU / Gallon #2 Diesel Fuel (40 Cetane) 133,000 BTU / Gallon #2 Diesel Fuel (45 Cetane) 129,000 BTU / Gallon #1 Diesel Fuel (53 Cetane) 126,000 B