The Economist article fails to mention that electrical vehicles are massively subsidized by governments. The production and adoption of electrical vehicles would not exist, but for these http://dailycaller.com/2015/08/10/tesla-is-hemorrhaging-mone... subsidies. As an honest observer, the natural market forces that would influence a rational decision to adopt electrical vehicles, do not exist. The true cost of electrical vehicles for transportation far exceeds that of the internal combustion, for motive power.
I will stipulate to the fact that electrical vehicles are more efficient. But efficiency doesn't equate to "less expensive."