All grades of avgas that meet CAN 2-3, 25-M82 have a density of 6.01 lb/U.S. gal at 15 --C, or 0.721 kg/l. (6 lb/U.S. gal is commonly used for weight and balance computation.) Density increases to 6.41 lb/US gallon, or 0.769 kg/l, at -40 --C, and decreases by about 0.1% per 1 --C (1.8 --F) increase in temperature.read more >>