Audi TT review - MPG, CO2 and running costs

The least powerful 2.0-litre petrol, the 40 TFSI, comes with a seven-speed S tronic gearbox, claiming 42.2mpg economy and CO2 emissions of 153g/km, while the 45 TFSI – in quattro all-wheel-drive S tronic guise – delivers 35.3mpg and 181g/km. Opting for the Roadster model sees a slight fall in efficiency, with the 40 TFSI managing a best of 40.9mpg, and 157g/km of CO2.

Moving up to the performance-focused TT S version still sees average fuel economy of 34mpg, although emissions rise to 189g/km. The 394bhp TT RS pays the penalty for running its 2.5-litre, five-cylinder petrol engine, with an economy figure (on the combined cycle) of 31.7mpg - which is perhaps rather optimistic if you intend to exploit the full power of the RS on a regular basis. CO2 emissions start at 202g/km.

Insurance Groups

Predictably, the 40 TFSI models are the cheapest versions of the Audi TT to insure; they fall into group 35. The 45 TFSI is in group 37 in both manual and S tronic guises and group 39 for the quattro model.

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Depreciation

Despite being on sale since 2014, the third-generation TT is still a relatively strong performer on the used market. Our expert data suggests that, after a typical three-year/36,000-mile ownership period, it should hold onto around 53 per cent of its original list price. The new BMW 2 Series offers similar residuals, while the Porsche Cayman betters both its rivals by retaining between 60 to 68 per cent of its showroom price after three years of motoring.