The 2011 Audi A8 with the 372 horsepower V8 engine will offer exceptional fuel economy of 17 city and 27 highway. These ratings place the A8 far ahead of its BMW and Mercedes V8 powered competition. Surprisingly, the A8 with its conventional V8 engine and 8 speed gearbox also tops its German rivals' hybrid efforts fuel economy wise. The BMW 7 series ActiveHybrid trails the A8 by 1 mpg on the highway and the Mercedes S400 hybrid comes up 2 mpg short.

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