Houston-based Conoco-Phillips became the latest big oil company to get out of the filling station business, agreeing Wednesday to sell its last 600 U.S. gasoline stations to PetroSun Fuel of Seattle.

The purchase price wasn’t disclosed, but published estimates of $800 million are considered close to the mark.

The stations, largely on the West Coast, operate under the Conoco, Phillips 66 and 76 brands.

PetroSun, which has been accumulating stations, said it planned major upgrades in product offerings to focus on the more profitable convenience store side of the business. The company will emulate upscale and Asian convenience store chains that focus on high-quality, fresh foods sold in clean, stylish surroundings.