I don't know the answer to the first question,but your second question is easy.Originally Posted by Refujoi
Since you are travelling with constant speed, average speed is 80km/h
It depends on where you are.Originally Posted by Refujoi
US quarts are smaller than a litre, so you get more for your money with the 2l bottle.
UK quarts were larger than a litre, so you would have gotten more for
your money with a 2 UK-quart bottle.