I saw a comment in that thread on "how much you spend in gas" about a spout that someone is using and it reminded me of a very handy tool that I found a couple of years ago at either Bass Pro Shops or Overtons. Its a simple hose with a syphon mechanism and works great for getting gas from a can into the boat without spilling a drop!!! If you're like me and constantly filling the boat at the lift/dock, pick up one of these and you will be glad you did...

Can't seem to find it on Bass Pro Shops or Overtons website, but did find this link. I think the one I bought was $10-15.