The choice of the test fuel shall be made based on the exhaust limit values that the engine type or the engine family is intended to comply with . Based on the power bands described in the Regulation setting uniform provisions concerning the approval of compression ignition ( C.I . ) engines to be installed in agricultural and forestry tractors and in non-road mobile machinery with regard to the emissions of pollutants by the engine , the reference fuel shall be selected as follows : Annex 7 Table 1 for power bands D to G