Formula to convert 3.4 liters to gallons is to multiply 3.4 by 0.264172 (this is the value for 1 liter to gallon).
Convert 3.4 Liters to Gallons results
3.4 x 0.264172052 = 0.89818497816
3.4 l = 0.9 gal
To conclude the answer for 3.4 liters is zero point nine gallons