Example:
15 nautical mile per US gallon = 7.343633e-15 Em/L
1 nautical mile per US gallon = 4.895755e-16 Em/L | 1 Em/L = 2.042586e+15 nautical mile per US gallon
Conversion Steps:
15 × (489.5755247 / 1e+18) = 7.343633e-15