Emissions
EVs produce no tailpipe emissions. Even when the power is generated using fossil fuels, electric vehicles usually show significant reductions in overall global carbon emissions over gasoline vehicles due to the highly carbon-intensive process of mining, pumping, refining and transporting gasoline.
Energy Efficiency
Internal combustion engines are relatively inefficient at converting fuel energy to propulsion as most of the energy is wasted as heat. Electric motors are more efficient in converting stored energy into propulsion, and electric-drive vehicles do not consume energy while at rest or coasting. Additionally, regenerative braking can be used to recapture energy during braking. Typically, conventional gasoline engines effectively use only 15 percent of the fuel-energy content to move the vehicle or to power accessories, while electric-drive vehicles have on-board efficiency of around 80 percent.
Electric cars are not completely environmentally friendly as there can be significant issues to consider related to energy and material use in the manufacturing process. This may include energy-intensive manufacturing processes or the mining and refinement of chemicals and materials.