Romania is the sole European Union member state to experience a month-over-month increase in diesel prices in May 2026, according to Eurostat data released Monday. Overall, transportation fuel and lubricant costs in Romania rose by 30.4% compared to May 2025, representing the fourth-largest increase within the EU. While other EU countries saw diesel prices decline, Romania bucked the trend with a price hike. This makes Romania an outlier in the European fuel market. The data indicates a significant year-over-year increase in fuel costs for Romanian consumers. The rise in prices is impacting personal transportation expenses within the country. Eurostat’s findings highlight a divergence in fuel price dynamics across the EU.