Example:
15 Pm/L = 3.063879e+13 nautical mile per US gallon
1 Pm/L = 2.042586e+12 nautical mile per US gallon | 1 nautical mile per US gallon = 4.895755e-13 Pm/L
Conversion Steps:
15 × (1e+15 / 489.5755247) = 3.063879e+13