We'll be renting a car in Malaga and travelling all through Andalusia for a week. Was wondering what gasoline (or petrol,or whatever y'all call it)HA! prices are going to be. Also, are there self serve gas stations or just full service? And IF they are self serve, is it fairly similar to the method in the USA?
Also read on someone else's post about fees when leaving an airport in a rent car. What's this?

The Spanish Ministery of Industry has a list with all gas station prices in Spain .

As for the stations, I'm afraid nearly all of them in Spain are self-serve. Unlike other countries where self-serve stations are cheaper than full ones, here you pay the same and you do the work.

I've never had to pay a fee leaving any airport in Spain. One thing to watch out for is whether the car you are driving takes diesel (gasoleo). A lot of rentals do.

Actually, some gas stations are full serve only. Many of the small ones in cities are (frequently one or two pump Repsol that are on the sidewalk or at the side of the street) and the regular BP near Plaza Cataluna (Calle Dr Arce in El Viso neighborhood) is also full service. I've seen the small pump places in Madrid, Merida, Barcelona, etc. Out on the motorways and highways they are almost always self-serve. Both have the same price!