registration statistics available at the time of the investigation in order to reflect the Italian fleet distribution of the high-performance motorcycles. The fuel was commercial unleaded gasoline with a research octane number (RON) of 95, with oxygenated additive (8.1 v/v%), while the carbon, oxygen, benzene and aromatic contents were 85.56 wt%, 1.8 wt%, 0.67 vol% and 33.3 vol%, respectively.