Liters measure volume and pounds measure weight. Pilots convert using fuel density. Jet A, AVGAS, and Jet B have different planning densities.

6.7 lb per US gallon (~0.80 kg/L) near 15°C. Prefer the fuel-ticket density for final weight-and-balance.

6.0 lb per US gallon (~0.72 kg/L). Actual density varies with temperature.