Shell user here as well. Premium only. Premium in Virginia is about 20 cents higher on average than mid-test. I use Shell because of top tier gasoline which I learned about through the forum a while back in a similar thread.

http://www.toptiergas.com/index.html

Shell used to be about 10 cents more expensive than the 'bargain gas' stations around my college in Fredericksburg, VA such as Wawa. However since prices have been going up Wawa gas has become evenly priced with Shell in Fredericksburg. Not only that but near my home in Northern VA (20 min. from DC) gas prices are now equal to the prices in Fredericksburg. Prices in Fred used to be significantly cheaper than NoVA up until 3 months ago or so.