Higher road-fuel prices have cost the European Union an estimated €53 billion since the Iran war began, with diesel accounting for €40 billion of the total, according to a Transport & Environment report published Wednesday. The Brussels-based environmental group estimates that fuel-price increases added an average €270 million a day to transport costs over the 28 weeks through Sept. 6, including €203 million for diesel and €67 million for petrol. The comparison is with the same period a year earlier, adjusted for inflation. Diesel and gasoil represent about 43% of EU oil-product use by volume, roughly twice the U.S. share, while road transport consumed 77% of the bloc's diesel and gasoil in 2024. T&E estimates that the average EU diesel-car driver paid €142 more during the period studied, and that a 50-litre tank cost about €30 more on Sept. 14. An average German long-haul diesel truck incurred about €6,000 in additional fuel costs over the period, or €236 a week. Disruptions to Middle Eastern fuel production and exports, along with attacks on Russian refineries, have tightened refined-diesel supplies. T&E says combined diesel and gasoil exports from the Middle East and Russia fell almost 75% in August from a year earlier, while the gap between crude oil and wholesale diesel exceeded $100 a barrel in early September. The weighted average EU diesel price reached a record €2.159 a litre on Sept. 14 in the European Commission's series dating to 2005. T&E says measures including additional remote working, lower motorway speed limits, better public transport and fuel-saving driving could reduce car-diesel demand by 15% in the short term, while electric vehicles could reduce Europe's exposure to oil-price shocks.