diesel-prices
The Physics of Fiscal Vacuum
The water spreading in the Naviglio Grande canal in Milan is not just an environmental disaster: it’s the perfect analogy for how energy subsidies are acting on the Italian market. Like the oil slick that traveled 28 kilometers, reaching the Darsena, state aid to the fuel sector has diluted until losing its structural effectiveness, leaving behind only a financially unsustainable density for critical points in the network. The signal is not the high price itself — which has reached €2.231 per liter on average at self-service stations nationwide — but the speed with which the State is withdrawing the dam.
Law Decree No. 153 of August 26, 2026 extended the reduction in excise tax on diesel fuel, but with a logic of progressive reduction that betrays a change of course. From a discount of 17.1 cents per liter, it went to 12.2 cents for the week from September 18 to 25, and then drastically down to just 6.1 cents from September 26 until October 5. This is not an emergency intervention; it’s a controlled dismantling of state protection.
“Law decrees draw on the State budget, ministerial decrees do not: they are the mobile excise tax…” — Il Fatto Quotidiano
The crucial observation is that the government is no longer paying the difference. It is asking distributors and distribution chains to absorb the thermal shock of the global market without fiscal buffers. The 64% reduction in the discount in a few weeks transforms the excise tax from a stabilizing variable into a volatility multiplier.
The Structural Inequality of Asphalt
While the national average price stands at around €2.23 per liter for self-service diesel, the reality of heavy mobility tells a different story. On the highway network, prices communicated by operators regularly exceed €2.90 per liter in attended mode, with documented peaks approaching or exceeding €3.10 per liter. The difference between the price at the pump on highways and that on the regular road network is approximately 80 cents per liter.
This disparity is not a market arbitrage, but an implicit tax on essential mobility. The transport of goods, which has no immediate physical alternatives for long distances, pays this differential as if it were an additional toll imposed by the scarcity of logistical options. For a truck driver who must fill a 45-liter tank on the highway, the cost rises to over €107 compared to approximately €100 needed on the regular road network.
The underlying mechanism implies a compression of operating margins that cannot be absorbed by efficiency. When fuel costs almost €3 per liter on highways, every kilometer traveled is a net loss event for logistics companies. The demand for diesel for heavy vehicles is inelastic: it is not possible to replace diesel with electricity over a 500-kilometer route in the short term, nor is it possible to reduce the frequency of trips without breaking supply chains.
The Aviation Effect and the Supply Chain
The cost of energy doesn’t stop at the engines of cars or trucks. A often-overlooked but systemically relevant factor is the increase in jet fuel, which registered an average increase of 18% in just two weeks in September, approaching historical highs from April. This rise is not isolated: it reflects the same dynamics of global refining capacity shortages and geopolitical tensions affecting crude oil.
“In September, jet fuel registers an average increase of 18% in two weeks, approaching April’s highs.” — ANSA.it
The impact of this price increase spreads throughout the real economy. Air freight is often the last resort for urgent or high-value shipments; when its cost explodes, consumer price inflation accelerates. It’s not just an increase in the airfare, but an increase in the final logistical cost for goods that depend on global supply chains.
The combination of the collapse of the excise tax on land diesel and the surge in air transport costs creates a distorted scenario: private and commercial road mobility is exposed to market volatility, while air logistics experiences a liquidity shock. The system is not responding efficiently; it is experiencing differentiated thermal pressure that affects different rings of the economic chain.
The Fragility of Trust in the Market
Beyond the numbers, there is an issue of physical integrity of the system. In Rome and Lazio, the Guardia di Finanza (Financial Police) seized 165 tons of non-compliant fuels in 2026, with samples containing water in gasoline and adulterated diesel. This phenomenon is not a mere incident; it’s a symptom of a market under extreme stress where the drive to reduce costs leads to the search for illegal shortcuts.
When consumer prices are high, the temptation to introduce additives or diluents into fuels increases. The result is not only damage to motorists’ engines—jerks, loss of power, engine warning lights on—but an erosion of trust in national energy infrastructure. Regulation struggles to keep pace with the speed at which prices rise and fraud evolves.
The anomaly revealed by the data is not just the height of the prices, but the discrepancy between the government’s narrative of “selective measures” and the material reality of a market where diesel costs what it costs on the highway. The reduction in excise duty has not mitigated the pain; it has simply shifted it from the state budget to that of families and businesses.
The Constraint That Remains
The euphoria assumed that subsidies could indefinitely contain the impact of geopolitics on domestic prices; data show a government withdrawing protection, allowing the global market to dictate the price. The result is not normalization, but a new phase of structural volatility where the cost of energy becomes the main constraint on Italian economic growth.
The strategic question that emerges is not how long the current price level will last, but how a diesel-based logistics system can survive an 80-cent per liter highway differential. As long as global refining remains a bottleneck and tensions in the Middle East persist, the price of diesel will not return to pre-crisis levels; it will only change the form in which we pay for it.
Photo by Joachim Schnürle on Unsplash
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