US — The average price of diesel fuel in the United States has risen to more than $5 per gallon, while the national average for regular gasoline stands at approximately $3.94 to nearly $4 per gallon as of July 10, 2026, according to AAA. The increase marks a sharp escalation from previous years and adds pressure on consumers and businesses reliant on fuel for transportation and logistics.

The rise in diesel prices represents a significant jump from $3.72 per gallon one year earlier on July 10, 2025. Regular gasoline prices have also climbed, increasing by 15 cents in just one week leading up to the July 10 reporting date. In Pennsylvania, current averages are even higher, with gasoline priced at $3.96 per gallon and diesel at $5.36 per gallon.

Robert Sinclair Jr., an AAA spokesman, emphasized the broad economic consequences of rising diesel costs. "The impact is universal. Everything gets to the retail consumer by diesel-burning truck," he said.

Sinclair also described the fuel market as highly volatile, noting, "So much of this is happening on whim that’s its really impossible. The markets respond to whim. This is a market subject to rumors and other kinds of activities rumor or imagined."

Despite high refining activity, fuel prices have continued to climb. U.S. refineries operated at 96% of capacity in June 2026 and processed the largest volume of crude oil in the second quarter since 2019. Yet, these efforts have not translated into lower prices at the pump.

The U.S. Energy Information Administration reported that gasoline crack spreads—the difference between the price of refined gasoline and crude oil—are up 60% compared to a year ago. Diesel and jet fuel crack spreads have more than doubled since 2025 levels.

Crude oil prices also contribute to the trend, with a barrel of oil trading at about $81 as of July 10, 2026. Andy Lipow, president of Lipow Oil Associates, noted that U.S. gasoline inventories currently stand at 210 million barrels, which is 20 million barrels above what is considered critical. Despite this surplus, prices remain elevated.

Regional variations persist. As of July 16, 2026, the average cost of regular gasoline in South Carolina was $3.67 per gallon, slightly below the national average. Historical data from Pennsylvania illustrates the long-term price escalation: in 2010, gasoline averaged $2.85 and diesel $3.15; by 2015, those figures had dropped to $2.51 and $2.71, respectively; and in 2020, they reached $2.24 for gasoline and $2.55 for diesel.

Fuel prices directly affect household budgets and the cost of goods across the economy. Diesel, in particular, is essential for freight transport, meaning price increases ripple through supply chains and ultimately raise prices for consumers. The current price levels—especially for diesel, which has surpassed $5 nationally and exceeded $5.30 in states like Pennsylvania—highlight sustained pressure on both personal and commercial transportation costs.

Although U.S. refineries are operating near full capacity and gasoline inventories remain well above critical thresholds, market dynamics such as crack spreads and crude oil pricing continue to drive prices upward. The volatility described by AAA’s Sinclair underscores how sensitive fuel markets are to perception and speculation, even amid robust supply indicators.