With its all-new A4, Audi has pulled off a rare hat trick -- producing a car that's bigger, faster, and more fuel efficient.Powering the Brilliant Red 2009 Audi A4 2.0 T quattro Tiptronic through our battery of instrumented flogging was a heavily massaged version of Audi's 2.0L mill that's become a staple of the Volkswagen Group parts bin. The engine has undergone numerous incremental improvements, the biggest of which being the addition of Audi's valve-lift system.Audi's powertrain brains developed the valve lift system in order to allow for variable control of the exhaust valves, improving the engine's charge cycle, according to the automaker.Amping-up the charge cycle helped the engineers to increase torque and bring it on earlier, lifting the engine's lb-ft of torque to 258 @ 1500 rpm (vs. 207 @ 1800 rpm for the outgoing engine). Horsepower is also up (now 211 vs. 200). Interestingly, the 2.0L's torque figure is slightly greater than the 2009 A4's optional 3.2L V-6 engine (listed at 243 lb-ft and 265 hp). So why would we want the six again?