Example:
15 Pm/L = 3.528219e+13 mile per US gallon
1 Pm/L = 2.352146e+12 mile per US gallon | 1 mile per US gallon = 4.251437e-13 Pm/L
Conversion Steps:
15 × (1e+15 / 425.1437075) = 3.528219e+13