24-Hour Fueling Available! Mixon-Nollner Oil Co., Inc., in Carthage, Tennessee, is the area's leading fuel company serving Carthage, Lebanon, Smith County and surrounding areas since 1918. We specialize in fuel, bulk fuel and delivery, diesel, 24-hour fuel and much more. For all your fuel needs, visit Mixon-Nollner Oil Co., Inc. in Carthage.