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Byline: JULIAN RENDELL
General Motors' Chevrolet Volt plug-in hybrid undoubtedly will break the mold when it goes on sale in 2010. But owners of the European version, the Opel/Vauxhall Ampera (on sale in late 2011)or Volt owners who live in big U.S. citiesmight not experience full save-the-world green performance.
That's the fear of engineers working at GM's European test center in Mainz-Kastel, Germany.
The Ampera will theoretically boast fabulous green performance figures, with GM predicting 151 mpg and carbon-dioxide emissions of less than 40 grams per kilometer in the European combined test cycle. That's at least three times better than for a similar-sized diesel-powered sedan.
The savings come largely because the Ampera will drive 60 kilometers of the 100-kilometer test solely on electric power. The other 40 kilometers will be covered with the electricity generated by a 1.4-liter gasoline engine running at a constant speed.
So, what's the problem? In real-world European operating conditions, the Ampera's fuel consumption might drop to 75 mpg, and its tailpipe emissions might rise to 80 grams per kilometerstill hugely ...
Source: HighBeam Research, Plug-in Puzzlers; LIMITED PARKING COULD HAMPER RECHARGING.(NEWS)