Example:
15 nautical mile per US gallon = 7.343633e-12 Pm/L
1 nautical mile per US gallon = 4.895755e-13 Pm/L | 1 Pm/L = 2.042586e+12 nautical mile per US gallon
Conversion Steps:
15 × (489.5755247 / 1e+15) = 7.343633e-12