United States - Average Price: Automotive Diesel Fuel (Cost per Gallon/3.785 Liters) in U.S. City Average was 3.74600 Index in July of 2025, according to the United States Federal Reserve. Historically, United States - Average Price: Automotive Diesel Fuel (Cost per Gallon/3.785 Liters) in U.S. City Average reached a record high of 5.75800 in June of 2022 and a record low of 1.09400 in February of 1999. Trading Economics provides the current actual value, an historical data chart and related indicators for United States - Average Price: Automotive Diesel Fuel (Cost per Gallon/3.785 Liters) in U.S. City Average - last updated from the United States Federal Reserve on September of 2025.