Trump’s hidden tax on every American: how diesel touches everything that hits your wallet

Diesel fuel, a vital energy source for numerous heavy-duty operations, has seen record-breaking prices that have significantly impacted the wallets of Americans. According to the U.S. Energy Information Administration, national average diesel prices reached $6.59 a gallon in September 2026, a 74% increase from the same period in 2025.

This surge in diesel costs is primarily driven by geopolitical tensions, such as the U.S.-Iran war and the Russian-Ukraine conflict, which have disrupted oil production and supply chains worldwide.

The ongoing conflicts have led to a near-complete closure of the Strait of Hormuz, reducing the global flow of crude oil and subsequently diesel, gasoline, jet fuel, and heating oil. Additionally, Ukrainian attacks on Russian refineries have further limited the availability of Russian diesel in the global market. Consequently, the scarcity of diesel fuel combined with persistent demand has driven prices higher, as supply meets demand.

The consequences of these rising diesel prices are far-reaching and affect various sectors of the economy. For instance, the trucking industry plays a crucial role in transporting goods, and high fuel costs directly impact their operating expenses. A 20% increase in fuel costs can result in a 4% rise in trucking costs, which are inevitably passed on to consumers through higher prices for goods and services.

Moreover, diesel-powered equipment is essential for farming and harvesting operations, which are heavily reliant on this fuel source. When fuel costs soar, farmers may delay planting and harvesting, leading to reduced food production and increased prices for consumers.

Public transit systems also suffer from high diesel prices. Buses and trains powered by diesel fuel experience direct fuel cost increases, while higher diesel and gasoline prices lead to increased demand for public transit, resulting in further price hikes for passengers. Similarly, air fares have become more expensive due to the use of diesel and jet fuel in aircraft engines.

Consumer prices vary across regions based on the distances goods need to travel and the availability of fuel. California, for example, has the highest average diesel prices at over $8 a gallon, while the Gulf Coast experiences comparatively lower prices of $6.03 a gallon. This disparity is attributed to the presence of numerous refineries and terminals along the Gulf Coast, while California depends on Middle Eastern oil imports due to its limited pipeline connections to other refining regions.

Additionally, California's stringent air pollution regulations necessitate more refined diesel fuel, making it difficult for fuel companies to import diesel from other regions. State and local taxes also contribute to the overall cost of diesel, with California imposing a 24.4 cents a gallon federal tax, 48.2 cents a gallon state tax, and a 13% sales tax, along with potential local taxes.