Typical diesel specs

Gross heat of combustion btus/lbs. ASTM D-240/D-4868  19150 min./19520 max.
Net heat of combustion btus/lbs. ASTM D-240/D-4868  18030 min./18330 max.

Gross heat of combustion btu/gallon ASTM D-240/D-4868  140,000 min./146,200 max.
Net heat of combustion btu/gallon  ASTM D-240/D-4868  131,500 min./137,500 max.