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So there is just a bus going to Santomera. It takes ~40 min from Murcia central bus station to Santomera and costs 2,05 €. Get out on the last bus stop in Santomera and be prepared for ~3km walk till autovia plus ~1km on autovia itself untill you reach the gas station (there's no other way, you basically have to walk a bit on the autovia in order to get to the spot)...

Despide difficulties to get to the the petrol station is quite busy and it's fairly easy to catch a long ride there.