Thats the bad bit. It's around £9K extra
Got this from another site :-
Quote:
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The 90-degree 32-valve V8 features a pair of variable-geometry turbochargers and delivers 326 horsepower and 550 lb-ft of torque, which is available starting at just 1,800 RPM. That power is channeled to the quattro drive via a six-speed Tiptronic. Performance is noteworthy, as the sizeable SUV makes the rush to 62 mph in just 6.2 seconds and has a top speed of 146 mph. Despite all this, the Q7 4.2 TDI delivers over 21 mpg of fuel economy in the combined cycle.
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So quite a bit more torque and acceleration at the cost of reduced but still reasonable fuel economy.