Our society needs mobility. With DI Diesel engine the lowest fuel consumption can be reached. The high durability of a DI Diesel engine enables the most economical utilisation of the material during the TOTAL LIFE CYCLE of a vehicle.The majority of the vehicles need a light weight high speed prime mover with the nominal engine speed above 4000 R.P.M.However the classic DI Diesel engine design results in heavy engine structure and relatively low engine speed. The High speed DI Diesel engines converted from the gasoline engine structure lack durability and the maximal possible engine power is limited.The new engine structure design (STEYR M1 Monoblock engine) allows DI Diesel combustion process, combined with high specific power, high engine durability and low specific engine weight. The electronically controlled high pressure fuel system, enables high engine nominal speed, low combustion noise, good startability at low ambient temperatures and the lowest possible fuel consumption. The sophisticated fuel system enables also low pollution emissions.The combination of above properties is an ideal combination, in order to reduce the wastefulness of limited world resources during the TOTAL LIFE CYCLE of the vehicle.