Formula to convert 7.8 liters to gallons is to multiply 7.8 by 0.264172 (this is the value for 1 liter to gallon).
Convert 7.8 Liters to Gallons results
7.8 x 0.264172052 = 2.06054200872
7.8 l = 2.06 gal
To conclude the answer for 7.8 liters is two point zero six gallons