but,as usual, cons exist for hybrid cars also. The practical viability of energy efficiency is considered as the major question among the cons. the proficiency to attain high speed is also checked in most cases. the battery life and the cont for the battery change is considered to be an inevitable con associated with the hybrid car. the security factors raised due to the light weight body is also a risk for hybrid cars however, the government seem to be impressed with the attributes of hybrid cars such as less pollution and higher energy efficiency. Government allows tax credit and deductions for the promotion of hybrid cars . it is also often added among the the pros for the hybrid cars. the cone have to be considered as motivating factors for the improvisation of the hybrid cars