Well considering the Chevy Volt concept is only to run 40 miles on a charge before switching to gas, Id say an impala that can run an 8hr shift before needing to be recharged is quite the achievement. Of course there were no information given if that was continuous run or just how much actual drive time that involved.
I would think to be really successful an all electric car would have to be able to go around 150 miles or so before needing to be recharged. Granted 40 miles the volt proposes is good and would accommodate many drivers, here in the mid west and central plains, much fewer people are that close to work and other points of interest. A good 150 - 200 mile range on a charge would cover probably 75% of the drivers in the US.
