Once again, the 2-liter to 2.5-liter engine category goes to Audi's 2.5-liter turbo. With direct injection and a turbocharger, this five-cylinder engine produces 315 horsepower, yet has achieved over 30 mpg in European fuel economy testing.
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June 14, 2012 11:31 AM PDT
Photo by: Audi
| Caption by: Wayne Cunningham
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