Welcome to Stonington CITGO, your local CITGO on 48 Stonington Rd in Mystic, Connecticut! Our gas station hours are Mon-Sun 6am - 10pm. With continuous use, TOP TIER™ CITGO TriCLEAN® gasoline keeps fuel injectors and intake valves clean while minimizing emissions. CITGO fuel doesn’t just help your vehicle run smoother. Our locally owned station helps keep our whole community humming. Looking for great deals on gas or goods? Download the Club CITGO mobile app, our fuel rewards program, and start saving today! GO where we’re always Fueling Good.