Running on Empty is a custom survival map I created for Left 4 Dead 2 using stock assets by Valve. The setting was based on reference pictures I gathered using Google Maps. The players start on the roof of the gas station where they are well stocked to fight the horde. But once their supplies start to dwindle, they must leave the safety of the roof to find more items and weapons in order to survive.
"The survivors find themselves stranded on a back road in rural Pennsylvania. Running low on fuel and hope, they search through an abandoned gas station for any signs of life."
Download here: http://steamcommunity.com/sharedfiles/filedetails/?id=1229985193
Here's an overview of the map.