The 2015 Audi A6 is a mid-size luxury ... themselves stand out as more fashion-forward. Audi claims best-in-class fuel economy for the 2.0T model, which achieves up to 25 mpg city, 33 highway. The TDI ...

The 4.0 TDI thus develops its immense power with no perceptible lag: It is available immediately upon depressing the accelerator. That is a major plus, particularly when starting off. The Audi ...