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First petrol station behind Prague on {{Dcz|5}} Fairly big one with McD's and enough cars. From metro "Zličín" (line B, yellow), take a bus 307, 308, 311, 380 or 602 to "Rudná, škola" stop. The ticket costs 18 Kč (~eur 0.66; 1 zone out of Prague). Once you get off, walk couple of meters in the direction the bus came from and turn left onto a street called "Na Přídělu". You should see the gas petrol station in the distance. Walk to the end of the street, there will be a footpath towards the petrol station. You need the opposite direction so get to the other side of motorway by the tunnel at the end of closer petrol station. It's a 5-10 minutes walk in total.

If you prefer gas petrol stations, try this option. The first one is quite far though (30 km from Prague center) - take a bus from Praha-Hradčanská (Metro ''Dejvická'') to ''Velká Dobrá, u skoly''. Once there follow the direction of the bus and turn first left (Unhošťská street), than second right (Lesní street) and after 200 m you should see the highway and the gas petrol station on your right.