About Hybrid vehicle :

A hybrid vehicle has three major systems
1. A primary power source, either an IC engine driven generator where the IC engine only operates in the most
   Fil's Auto Corner: Gasoline efficient part of it's performance map, or alternatives such as fuel cells and turbines.
2. A power storage unit, which can be a flywheel, battery, or ultracapacitor.
3. A drive unit, almost always now an electric motor that can used as a generator during braking. Regenerative
   braking may increase the operational range about 8-13%.

Hybrid vehicles may enable this problem to be at least partially overcome, but they remain expensive, and the current ZEV proposals exclude fuel cells and hybrids systems, but this is being re-evaluated.