Today I filled the tank to "full" by letting the gas pump sense the back pressure and shut off automatically. Shortly after, I stopped at a friend's place where the road was very crowned. I pulled to the side of the road and the passenger side was next to the curb. As I was talking to him, I noticed something dripping - no running out. The slant of the road was enough, and the fuel level high enough, and the cool gas was heating up enough that there was a dribble of gas out of the overflow line. Concerning to see something dripping to the ground! I pulled to level ground and it stopped.
Note to self. Keep the Goblin level.