Standard reference states: Nm³ at 0 °C & 1.01325 bar a; Sm³ at 15 °C & 1.01325 bar a; SCF at 60 °F & 14.696 psia. 1 Nm³ ≈ 37.33 SCF.
Fuel economy: L/100 km and km/L are reciprocal scales. 1 US gal = 3.785 411 784 L (1 mpg = 235.215 L/100 km); 1 UK gal = 4.546 09 L (1 mpg = 282.481 L/100 km).