my last motorized bicycle i was trying to figure out how to carry extra gas and ended up buying a gallon gas tank for the bike, the new one i am gonna be building will have a 4 stoke titan on it and they only hold 1/4 of a gallon so i will be very interested to see what people come up with. the nice part is i am on an island that is only 28 miles long and 8 miles wide and i will not have to mix oil and gas so i can just pull in the gas station and fill it up so not really sure if i will need to hold more. i should find out soon enough