I think that the mythbusters made a mistake in the Helium football experiment.
They took the experiment inside to eliminate wind so the results do varry.
But wouldn't the wind help the helium football go further than the normal ball. (seeing as its lighter.)
I think they should have a re-visit because of this fatal mistake.
They could also use other balls like soccerballs, basketballs and Aussie Rules ball for us Aussies!

Blaize.