For this conversion first of all you should know that

1Litre = 1 Kg of mass

1 Kg = 2.2 pounds

1Litre = 0.26 gallons

As 1Kg and 1Litre are equal, so 1Kg = 0.26 gallons

That would mean that 2.2pounds are equal to 0.26 gallons

and 5 pounds are equal to = (5 x 0.26)/2.2 => 0.59 gallons or almost 0.6 gallons

1Litre = 1 Kg of mass

1 Kg = 2.2 pounds

1Litre = 0.26 gallons

As 1Kg and 1Litre are equal, so 1Kg = 0.26 gallons

That would mean that 2.2pounds are equal to 0.26 gallons

and 5 pounds are equal to = (5 x 0.26)/2.2 => 0.59 gallons or almost 0.6 gallons