Example:
15 meter per UK gallon = 3.299532e-12 Tm/L
1 meter per UK gallon = 2.199688e-13 Tm/L | 1 Tm/L = 4.546099e+12 meter per UK gallon
Conversion Steps:
15 × (0.219968799 / 1e+12) = 3.299532e-12