Example:
15 kilometer per US gallon = 3.962581e-9 Tm/L
1 kilometer per US gallon = 2.641721e-10 Tm/L | 1 Tm/L = 3.785412e+9 kilometer per US gallon
Conversion Steps:
15 × (264.1720524 / 1e+12) = 3.962581e-9