Why hybrids often deliver lower mpg than advertised

The 2013 Toyota Avalon hybrid: Because of hybrids' complex powertrains and other factors, the gap between real-world fuel economy and the window label is often greater than it is with vehicles powered by conventional gasoline or diesel engines.

August 16, 2013 05:00 AM

DETROIT -- Many drivers of gasoline-electric hybrids never see their real-world fuel economy match the numbers on the EPA window sticker.

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