the fuel consumption type-approved by the approval authority in accordance with the provisions of Directive 80/1268/EEC and mentioned in Annex VIII of Directive 70/156/EEC and attached to the EC vehicle type-approval certificate or in the certificate of conformity. Where several variants and/or versions are grouped under one model, the value to be given for fuel consumption of that model shall be based on the variant and/or version with the highest official fuel consumption within that group