A gas station may or may not be a bad place to fortify due to most having large windows. And it always has food, and a number tend to include a restaurant for even more food, However they are also a death trap since they have gas to fill your car if you are passing by and are low on fuel, since the gas in the pumps can be used as a last resort to repel a siege from incoming zed. However the explosion from the exploding tanks can kill without the proper shielding and cover.