Audi A4 35TDI: Among the most affordable Audis on offer, the A4 has managed to secure a place on our list. Audi launched the A4 diesel earlier this year after launching the updated A4 petrol last year. When tested, the A4 35TDI did 0-100kmph in 7.96 seconds, which was is about a second quicker than its petrol counterpart’s time of 8.94 seconds. The A4 35TDI is powered by a 2.0-litre diesel engine which produces 190PS of power and 400Nm of torque, while the petrol A4 is powered by a 1.4-litre TFSI engine generating 150PS of power and 250Nm of torque. Both the engines are mated to a 7-speed S Tronic dual-clutch transmission.