The need for renewable energy sources and harvesting devices has increased over the years for environmental and economic reasons. Cars for example have gone through an important transformation in the past decade which led to the inception of the hybrid type. The idea is to harness some of the dissipated energy and reuse it to operate the car. A lot of energy is dissipated from the suspension system; therefore, harnessing that energy could be very useful in powering up electrical systems in the car. A magnetic mass-spring system to harvest the vibrational energy dissipated from the car’s suspension system and three dimensionless comfort levels for the passenger are presented. To maximize the regenerated electricity indicator and minimize the discomfort indices, a multi-objective function based on the above indices in conjunction with the Simulated Annealing method is used. The theoretical developments are demonstrated under constant and varied driving speeds and the simulation results show the energy harvester is capable of producing reasonable amounts of electricity while maintaining a good comfort level. Results reveal that the harvester can generate 0.045 Volts when the car travels at 60 km/h with an acceleration of 0.43 m/s2 and assumed base excitation amplitude of 0.05 m.