Example:
15 Tm/L = 3.528219e+10 mile per US gallon
1 Tm/L = 2.352146e+9 mile per US gallon | 1 mile per US gallon = 4.251437e-10 Tm/L
Conversion Steps:
15 × (1e+12 / 425.1437075) = 3.528219e+10