Shell On 3rd Avenue in Mankato is where you can fuel up your vehicle, get a homestyle cooked meal, and get the truck parts and accessories you need to keep you rolling. Located off Highway 14, just east of Highway 169, this gas station and truck stop offers gas and biodiesel fuels that carry the Shell name. Shell fuels and oils are formulated to help your vehicle operate cleaner, lengthen the life of your engine and get better mileage. Our convenience store has a wide variety of snacks and essentials that you might need, from the usual candy and snacks, to truck parts, CB radios, and lubricants such as diesel exhaust fluid (DEF).