Example:
15 meter per UK gallon = 3.299532e-15 Pm/L
1 meter per UK gallon = 2.199688e-16 Pm/L | 1 Pm/L = 4.546099e+15 meter per UK gallon
Conversion Steps:
15 × (0.219968799 / 1e+15) = 3.299532e-15