We've seen the 268bhp Audi TTS go on sale, and now the frugal, 168bhp 2.0-litre turbodiesel model has also been added to the ever expanding TT line up. Available to order from March this year, the TT coupé 2.0 TDI will cost £26,350 with a further £2000 needed for the open top model. That's £1450 more than the equivalent 2.0 TFSI models respectively. It’s claimed that the coupé TDI will hit 62mph in 7.5sec, has a top speed of 140mph, can achieve 53.3mpg on a combined run and emits just 140g/km of CO2.The roadster will go from 0 to 62mph in 7.7sec , continue to a top speed of 138mph, and return 51.3mpg on a combined run whilst emitting 145g/km of C02. The Audi TT TDI will appear at Geneva in roadster and coupé, with first deliveries taking place in the summer. The next model on the list is the hottest TT of them all. The TTRS is due to arrive before the end of the decade boasting 343bhp from a 2.5-litre twin turbo engine.