This is Shell Service Station near the on ramp to the A-8 (in Cantabria not Madrid). Gayle and I…read morestopped for gasoline here one morning on the way to the Picos De Europa. The per liter price was about 1.3 Euros per Liter (about $7 a Gallon), but our VW Golf made up for it with good gas mileage, good acceleration, and a fun manual stick). Also keep in mind that: A green pump handle doesn't mean Diesel. You can pump your petrol first and then walk in and pay. I didn't notice a single pay-at-the-pump swipe when I was here. Many Service Stations have a cafe, sell wine, and otherwise make stopping in a civilized experience.