This thread will help you run at 200% speed while NOT mounted!(epic increases speed by 100%)
Things needed:
Step one go into a BG or wherever you want. Mount up and climb upwards about 10 yards.
Step two type "/dismount" without the " ", you will be DC'd and when you return you will be dismounted but you will be running at epic mount speed(200%)
The bug will be removed when any change of speed occurs except for swimming.
Debuffs, stealthing, etc.
You can run inside at the same speed though because you're not mounted.