Formula to convert 42 liters to gallons is to multiply 42 by 0.264172 (this is the value for 1 liter to gallon).
Convert 42 Liters to Gallons results
42 x 0.264172052 = 11.0952262008
42 l = 11.1 gal
To conclude the answer for 42 liters is eleven point one gallons