The EuroShell card can be used at all Shell stations throughout Europe. The Circle K Europe card can be used throughout Europe at AGIP, ARAL, BP OMW and Cirkel K.
Use any fuel-route planner:
[Cirkel K](targetBlank:http://www.routex.com/home)
[Shell](targetBlank:http://www.shell.dk/products-services/on-the-road/shell-station-locator.html)