The big advantage of the Zippo is that you can light it with heavy gloves on and you don't have to keep a thumb on a lever to keep it going.
The inner tube doesn't prevent evaporation but it does slow it down quite a bit. Mine will last a week or more with the tube around it. A strip of tape will almost totally prevent evaporation but then you have to carry a roll of tape with you. Trying to get tape off with frozen fingers is a pain, too.
