Formula to convert 2.5 liters to gallons is to multiply 2.5 by 0.264172 (this is the value for 1 liter to gallon).
Convert 2.5 Liters to Gallons results
2.5 x 0.264172052 = 0.660430131
2.5 l = 0.66 gal
To conclude the answer for 2.5 liters is zero point sixty six gallons