The Audi Mileage Marathon, now completed, has provided convincing evidence of the efficiency of TDI engine technology. The fuel consumption of all 23 models in this 7,865-kilometer (4,887-mile) test was excellent. The best Audi A4 3.0 TDI quattro, for example, had an average fuel consumption of 5.3 liters per 100 kilometers (44.38 US mpg); the new Audi Q5 3.0 TDI performance SUV finished the test with a convincing 6.1 l/100 km (38.56 US mpg). In its first tough road test since it was announced, the Audi Q7 3.0 TDI with ultra low emission system performed outstandingly well: the world’s cleanest diesel scored a best average fuel consumption of 7.1 l/100 km (33.13 US mpg). The lowest consumption of all the cars taking part was the 4.7 l/100 km (50.04 US mpg) achieved by the Audi A3 2.0 TDI.