gatt I'm no expert but manage to do moderately well on occasion. The trick is to stay just out of the attackers gun solution without slowing down and maintaining (more or less) the same direction of travel as the attacker. You can do this by doing a loose, low-G barrel roll or by shallow S-turning - timing is important. If the attacker follows, tighten your maneuver enough to stay just outside of his guns. Essentially you're using the attacker's speed advantage against him.
Hope this helps.
Cheers,
asw