Mobility may be enhanced in future tanks by the use of diesel-electric or turbine-electric series hybrid drives — first used in a primitive, gasoline-engined form with Porsche's Elefant German tank destroyer of 1943 — improving fuel efficiency while reducing the size and weight of the power plant.[50] Furthermore, advances in gas turbine technology, including the use of advanced recuperators,[51] have allowed for reduction in engine volume and mass to less than 1 m3 and 1 metric ton, respectively, while maintaining fuel efficiency similar to that of a diesel engine.[52] In line with the new doctrine of network-centric warfare, the modern battle tank shows increasing sophistication in its electronics and communication systems.