Formula to convert 3.4 gallons to liters is to multiply 3.4 by 3.75841178 (this is the value for 1 gallon to liter).
Convert 3.4 Gallons to Liters results
3.4 x 3.78541178 = 12.870400052
3.4 gal = 12.87 l
It’s simple, the answer for 3.4 gallons is twelve point eight seven liters