Example:
15 Tm/L = 3.063879e+10 nautical mile per US gallon
1 Tm/L = 2.042586e+9 nautical mile per US gallon | 1 nautical mile per US gallon = 4.895755e-10 Tm/L
Conversion Steps:
15 × (1e+12 / 489.5755247) = 3.063879e+10