Giant Food in Washington, DC, metro has the same kind of rewards program with Shell, I think. I don't take advantage of it nearly as much as I should, but most of the Shell stations around me are a pain in the butt to get to and their prices are higher than most of the other stations.
The Safeway near me has its own fuel plaza, and you get rewards for shopping there that can be used at the fuel plaza, but I hate shopping at Safeway, so I rarely do unless I need something specific.