We have just returned from France and had a pretty scary experience with filling stations, so caution is recommended. We drove up to Calais using the A28 for much of the journey. There are very few service areas on that route with filling stations. We pulled off at several villages and these took only French cards. In the end we got to a toll area with a single pump, which was the only fuel outlet signposted from the A28. Again, it would only take French cards and by that time we were completely out of fuel. My first comment is, therefore, be careful. Always fill up, even if you still have some fuel left. It is better than the worry that we had. Secondly, however, at said pump, we pressed the 'Help' button, spoke to a really helpful chap, who sent 'assistance' at no charge to us. They used their card to put fuel into our tank and we just gave them the equivalent in cash (plus a tip because they were so nice). I am sure in England, they would have brought a can of fuel, overcharged for it and charged £50 for the call out. So, a scary experience turned out to be a great experience in meeting lovely and helpful French people. Anyway, my caution on the pumps and cards is a serious one. Happy travelling folks.