Similar to a plug-in hybrid electric vehicle, an EREV has a much bigger battery that typically provides an electric-only driving range of around 30 to 40 miles. Once the battery is discharged, a gasoline engine powers a generator that gives the vehicle an additional 200-300 miles of “extended-range” driving. Unlike a PHEV, the gasoline engine in an EREV does not directly drive the vehicle; it simply provides power to the battery which continues to propel the car using an electric motor. The Chevrolet Volt is an example of an EREV.