Formula to convert 6.6 liters to gallons is to multiply 6.6 by 0.264172 (this is the value for 1 liter to gallon).
Convert 6.6 Liters to Gallons results
6.6 x 0.264172052 = 1.74353554584
6.6 l = 1.74 gal
To conclude the answer for 6.6 liters is one point seventy four gallons