Real Decreto 837/2002, de 2 de agosto, por el que se regula la informacion relativa al consumo de combustible y a las emisiones de CO2 de los turismos nuevos que se pongan a la venta o se ofrezcan en arrendamiento financiero en territorio espanol. BOE n° 185 du 03/08/2002 p. 28851

This Royal Decree establishes rules for informing consumers about the fuel consumption and CO2 emissions of new passenger cars sold or leased in Spain. It aims to help consumers make informed choices. This affects car manufacturers, dealerships, and consumers purchasing or leasing new vehicles. It ensures consistent and clear information is provided at the point of sale.