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MANETs are a group of wireless computers which do not have pre-existing infrastructure in the form of communication network. Administration of these kinds of networks are not dependent on any special user. There are many problems in the creation of MANETs. such as routing in wireless media, power consumption, transportability and efficiency. Here we have concentrated mainly on the importance of efficiency related considerations. For example in the field of military, industrial, vehicular control and monitoring applications some crucial efficiency parameters should be considered. It involves packet delivery, routing overhead and shortest available path. A simulation was carried out to evaluate the efficiency of the seven MANET routing protocols (DSR, AODV, DSDV, TORA, FSR, CBRP and CGSR) so that an engineering methodology could be constructed depending on requirements, restrictions and availabilities. From the detailed simulation results and analysis, a suitable routing protocol can be chosen for a specified network and goal.