From the Words of Whizz-dom page on this very site:
Learn to spit
"About a year ago, while training for a marathon with a new running partner, I discovered what a difference spitting can make. Before this, the last few miles of my long runs were always uncomfortable because my mouth would get so pasty. But once I started spitting (being careful not to hit my training partner), long runs became much easier for me."
Jane Unger Hahn, 36. Years running: 6