I don't think I've seen a thread for old gas stations, so it's probably high-time to add one. I've taken a number of photos of cool old gas stations lately, which I now share with you:
The old Sonic gas station on North Main:
Santos - in Oak Cliff:
Abandoned - in White Settlement:
Paso del Norte - on Azle Avenue:
Magnolia Petroleum in downtown Dallas:
Sinclair - on McCart
If you have others, feel free to post 'em!