IEA, Average new global fuel economy of light-duty vehicles, 2006-2017, and GFEI 2030 target, IEA, Paris https://www.iea.org/data-and-statistics/charts/average-new-global-fuel-economy-of-light-duty-vehicles-2006-2017-and-gfei-2030-target, Licence: CC BY 4.0