The Truth About Cars discusses the conundrum being created by the introduction of plug-in hybrids and all electric vehicles.  Prior to their introduction we measured the efficiency of the internal combustion engine by miles per gallon (or litres per 100 kilometers in Canada).  But automotive efficiency measures are changing with these new vehicles which are either a blend of gasoline and electricity or pure electricity.

Now we have miles per gallon or litres per 100 km, kilowatt-hours per 100 miles, and the latest from Nissan – miles or kilometers per dollar.  The latter is a real stretch as both a country’s currency and the price of gasoline flucuate constantly.  In addition, the price of electricity varies from market to market and after being stable for decades is now changing annually.

All of which means that until we find a reliable and easily understandable metric to measure automobile energy efficiency, it will be  more and more difficult to compare the multitude of vehicles that will be arriving over the next few years in your area.



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