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Take bus number 36 towards Santomera/La Matanza (there are only 3 buses per day going further than Santomera, 10:30, 17:30 and ..., otherwise you have to walk like 2-3 km north from Santomera on the MU-414). Ask the driver to drop you off at the roundabout directly after crossing under the A-7. Take the small road on that roundabout eastwards and choose which side you want to hitchhike (there is a little tunnel after like 200 m). The petrol station is like a 20 minute walk away.
PS: By the small road it means the one that is initially not paved and leads to the left becoming a paved road after 100 meters or so.
Tested yesterday 25.03.2010 - worked like a charm. I waited around 30 minutes including the coffee I had in the gas station.
([http://maps.google.com/?ie=UTF8&ll=38.1,-1.042006&spn=0.007615,0.021973&t=h&z=16 location on map])