im pretty sure 1 gallon is approx 4 litres cause i saw the 1 gallon things of milk down when i was in bellingham at a supermarket and its the same size as our 4 litre jugs of milk.

btw your mcdonalds is REALLY expensive! i went down there and after the extange it was like 7-8 bucks for a regular meal thats only 5 bucks or so in canada. same with your denny's! omg your grand slam breakfastes are more expensive even without the exchange then ad that in :O