What is a hybrid electric vehicle (HEVs)?
Hybrid electric vehicles (HEVs) commercially available today combine an internal combustion engine with a battery and electric motor. This combination can offer the extended range and rapid refueling of a conventional vehicle, while reducing energy requirements and emissions. The practical benefits of HEVs might include improved fuel economy and lower emissions compared to conventional vehicles, however, not all HEVs are clean. Hybrids vary dramatically in emissions, depending on how big the battery is, and how well the engine is built. So be sure to check the emissions rating, if you're looking for a hybrid. SULEV or better is the cleanest choice.
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