Changes

Take bus number 36 towards Santomera/La Matanza (there are only 3 buses per day going further than Santomera, 10:30, 17:30 and ..., more going to Santomera but then you have to walk like 2 km more). 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 gas station is like a 20 minute walk away.