Beware at Spanish Service Stations. If there is one thing I hear countless times that is very easy to avoid it is the Spanish service station scam. Basically the scam is the following.
You pull into a service station and go for a drink or a rest. You come out get in your car and drive off. After a couple of kilometres you notice something is wrong with the car and more or less at the same time a car will start flashing you from behind. When you stop they will helpfully inform you that your back tyre is down and that you need to change it.