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MPG or performance: It's a trade with turbos

Some automakers say turbochargers offer high fuel economy and quick acceleration, the best of both worlds. Well, yes and no. Turbocharged vehicles allow automakers to keep power output high while they downsize engines for better fuel economy.

Driven: Toyota Aygo (2014)

When the original Aygo launched in 2005, it shared the A-segment with nine rivals, including its sister cars, the Citroën C1 and Peugeot 107. In 2014, there are 20 small city cars on the European market, placing extra pressure on the Aygo's designers to ensure it offers something unique and competitive. But while the design rethink needs to move the car forward, pragmatism dictates that a truly successful reinvention will ensure the Aygo also remains integrated with Toyota's line-up; it's one of the top sellers in Toyota's European portfolio, and a proven driver of brand loyalty.

GM may revive performance brands

General Motors Co. is studying whether to revive brands for performance vehicles to improve its image among go-fast car shoppers. At the Specialty Equipment Market Association trade show in Las Vegas last week, GM unveiled the Z-Spec Chevrolet Cruze, Volt and Spark cars, and two SS-badged Chevrolet Camaros.