When is double not double....?

When it's used by football commentators talking about two leg ties, such as tonight's Champion's League quarter finals!

This has irritated me for a long time - I've lost track of the number of times a commentator has used the phrase "away goals count double" when it's incorrect, mis-leading and downright lazy to do so.

For example, Chelsea are playing Liverpool tonight holding a 3-1 lead from the first leg at Anfield. If Liverpool were to win at 5-4 at Stamford Bridge they would go out 7-6 on aggregate. If away goals actually did count double they would go through 11-10.

I wish they'd get it right.