Camouflaged prototypes of the 2011 Audi A8 have been caught running the Nurburgring, and accompanying these newest shots comes word that Audi's reworked flagship will be available with a host of new powerplants.


According to reports, Audi's range-topper will continue to be available with a V12, but it's expected to grow from 6.1- to 6.5-liters and exceed 500 horsepower -- 50 hp more than the outgoing twelve. Stepping down from that would be a supercharged V8 with more than 400 horsepower and a cylinder management system that could shut down up to four cylinders.


To really get the gas mileage going, however, Audi is reportedly working on a new 2.0-liter diesel with two turbos that pumps out more than 200 horsepower. If the new powerplant comes to market, it would match Mercedes-Benz' BlueEfficiency four-cylinder in the S-Class. The new A8 is expected to debut at the Detroit Auto Show this January, with sales beginning in late 2010.
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