There is finally a gas station in Steiner Ranch called Wag A Bag. It gets its gas from Shell. The prices are competitive compared to the gas stations in and around Four Points (620/2222). It also has a pretty extensive beer and wine selection for a gas station and a fair amount of grocery items.
Wag A Bag Hours: Mon-Sat 6am-11pm, Sun 7am-11pm
Wag A Bag Phone Number: 512-266-8822
Wag A Bag Directions: Google Maps