CNN Money:

General Motors plans to start offering discounts to drivers using OnStar, a perk that will include offers at Dunkin’ Donuts and
 The service — dubbed “AtYourService” — will be offered to OnStar users in the U.S. and Canada starting in early 2015. OnStar, GM’s in-car information service, provides navigation tools and other services.
 The discounts will be offered when users ask for directions to a participating retailer. Search for the nearest Dunkin’ Donuts, for example, and you might get a deal on a coffee or snack.