E15

E15 is a designation used in several different contexts. The most prominent uses are as the name of an international road in the European E-road network and as a designation for a gasoline-ethanol fuel blend in North America.

European route E15 is a north-south corridor of the international E-road network. It runs from Inverness in the United Kingdom to Algeciras in southern Spain, passing through the UK, France, and Spain. The route generally follows national roads assigned by each country and connects major cities, ports, and industrial centers along its length. As part of the wider E-road system, the E15 designation indicates international significance beyond national road networks.

E15 fuel in the United States refers to gasoline containing 15 percent ethanol. It is intended for use in many light-duty vehicles manufactured for model year 2001 and newer, but compatibility varies by vehicle and by jurisdiction. Some automakers and warranties limit or discourage ethanol blends above E10, and certain engines or fuel systems may require ethanol-free gasoline. Availability has varied, with regulatory and infrastructure changes affecting station offerings and labeling.