Formula to convert 9.9 liters to gallons is to multiply 9.9 by 0.264172 (this is the value for 1 liter to gallon).
Convert 9.9 Liters to Gallons results
9.9 x 0.264172052 = 2.61530331876
9.9 l = 2.62 gal
To conclude the answer for 9.9 liters is two point sixty two gallons