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http://kinja.roadandtrack.com/why-ferrari-engineer... 
Government fuel-economy test cycles, especially those in Europe, approximate the driving style of a heavily sedated 83-year-old librarian. Since the engine is rarely taxed, the turbo doesn't spool up, so no extra fuel is used. But purposely driving slowly enough to keep the turbo from generating boost defeats the point of having a turbocharger in the first place. Sadly, out in the real world, riding that big, effortless wave of boosted midrange torque means burning extra fuel—and creating even more CO2. So much for reducing emissions.
Government fuel-economy test cycles, especially those in Europe, approximate the driving style of a heavily sedated 83-year-old librarian. Since the engine is rarely taxed, the turbo doesn't spool up, so no extra fuel is used. But purposely driving slowly enough to keep the turbo from generating boost defeats the point of having a turbocharger in the first place. Sadly, out in the real world, riding that big, effortless wave of boosted midrange torque means burning extra fuel—and creating even more CO2. So much for reducing emissions.
Young professional woman and busy mom.