How to get the priceGroup discount percentage into the price template?

Hi,

How do I pull the discounts of the pricegroup into the article template - specifically the price? I have the priceGroup ID available on the sArticle variable, but nothing more.
Will I need to create my own plugin to add the pricegroup discounts, or can I get at it in the template itself?

To clarify: the customer uses price groups to apply a single discount to certain groups of articles. So a pricegroup with just a single discount with a minimum article count of 1.