Yesterday I filled up my gas tank.  See, okay, I'll tell the whole story.  I just got back from Spain, and had to work yesterday at 8 am forty miles away.  Ugh.  So I left very early to get there on time.  There was a ton of construction and traffic, so I thought I'd be late.  Nope, there at 7:30.  I had about a half tank of gas, so I went across the street to fill 'er up while I waited.  I had half a tank.  My tank is ten gallons.  I put 5 gallo...