More Than Fuel Delivery Services. Fuel Logic is the leading diesel delivery company in the US. Our Fuel management solution represents millions of gallons of fuel spent every month. Fuel Logic works with companies and fleet and fuel managers nationwide to maximize their diesel fuel spend. We use this buying power to negotiate the best fuel prices for our customers. We regularly save our customers up to 70 cents a gallon and countless hours. Our fuel consultants are the best in the business with years of experience in both negotiation and fleet management. Our fuel solutions include mobile on-site fueling, card lock fueling, fleet fuel cards, bulk fuel tank service, and GPS tracking systems.