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21st
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Retracing the life, and death, of Rudolf Diesel in the mighty Audi Q7 V12 TDI.
Autobahn A8 runs between Munich and Stuttgart. The white Audi Q7 is headed for Augsburg. On a flat, straight stretch of autobahn, the tachometer is redlined at a leisurely 4200 rpm, yet the digital speedometer readout climbs to 287 kph - nearly 180 mph. That's what the world's only production twelve-cylinder diesel engine can do in a nearly three-ton SUV.
Photo Gallery: 2009 Audi Q7 V12 TDI - History of Rudolf Diesel - Automobile Magazine