Diesel fuel has long carried a premium over regular gasoline, a trend that has persisted with only rare exceptions since 2004. Currently, the national average for diesel stands at $6.38 per gallon—nearly $2 more than regular gas—a sharp increase from $3.60 last year. The price spike has become so severe that Republican members of Congress are lobbying President Trump to ban diesel exports, a move the administration is considering despite strong opposition from the American Petroleum Institute.
According to the Energy Information Administration, three primary factors explain why diesel commands a higher price: demand dynamics, air quality regulations, and taxation.
In the early 2000s, demand surged as China and India accelerated their industrialization, motorization, and infrastructure projects, all of which are heavily reliant on diesel. Simultaneously, Europe saw diesel car registrations climb from 13.8% in 1990 to 53% by 2007. Today, however, supply constraints play a larger role. Conflicts in Iran and Ukraine have limited refining capacity and crude production, while demand remains critical for trucking, rail, generator farms, and heating.
Regulatory changes also contributed to higher costs. In June 2006, federal standards mandated a reduction in the maximum sulfur content in diesel to combat air pollution. Producing ultra-low sulfur diesel requires more expensive refining and distribution processes. Additionally, federal excise taxes have favored gasoline; since 1993, the tax on on-highway diesel has been 24.4 cents per gallon, which is 6 cents higher than the equivalent rate for gasoline.
Banning exports seems like a short-sighted political stunt. If the market is tight, restricting supply will only make prices spike further nationwide.
$6.38 for diesel? I just assumed it was always pricier. This article actually explains why, which is refreshing compared to other coverage.
I never realized how much China and India drove up global diesel demand back in the early 2000s. That context is key here.