Example:
15 mile per UK gallon = 5.310093e-9 Tm/L
1 mile per UK gallon = 3.540062e-10 Tm/L | 1 Tm/L = 2.824809e+9 mile per UK gallon
Conversion Steps:
15 × (354.00619 / 1e+12) = 5.310093e-9