The Karma's all-electric range was found to be 32 miles by the EPA under its test criteria.

ENGADGET: Fisker Karma gets EPA-certified 52MPGe, sales ready to begin

The Energi has a nominal all-electric range of 21 miles, after which the gas engine comes whispering onstage.

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And in Chicago last week, Kia debuted its Cross GT Hybrid concept, which has an all-electric range of 20 miles.

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For example: Key to the Ford hybrid's system big numbers is its all-electric speed range of up to 62 mph.

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These join the luxury-oriented limited-production Tesla Model S all-electric and Fisker Karma extended-range electric sedans.

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The Leaf, a five-passenger, all-electric vehicle that will have a range of about 100 miles, will go on sale in the U.S. in December.

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Sales data shows that consumers have been showing more interest in plug-in hybrid and hybrid vehicles, over all-electric cars which have a limited driving range.

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This pack takes about 2.5 hours to fill up with a 240V charging station and provides a range of 21 miles (100MPGe) at up to 85mph in all-electric mode.

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But in vehicles that run for long periods on electricity only, like plug-in hybrids and all-electrics, engineers need to fully charge batteries to maximize driving range, the drawback to electric vehicles.

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It is optimized to provide the ability to travel in all-electric mode for typical daily use, but can also leverage the existing gasoline infrastructure to power its range extending generator, as needed, thereby eliminating 'Range Anxiety' and providing the freedom, flexibility, and peace of mind that comes with the extended range of a conventional vehicle.

ENGADGET: Fisker Karma gets EPA-certified 52MPGe, sales ready to begin