Example:
15 n.mile/L = 56.781177 nautical mile per US gallon
1 n.mile/L = 3.785412 nautical mile per US gallon | 1 nautical mile per US gallon = 0.264172 n.mile/L
Conversion Steps:
15 × (1853.24496 / 489.5755247) = 56.781176749