The ever onward technological march of the diesel engine continues, with a new unit each for Audi’s A5 and the Mazda6.
Starting with Audi, the A5 coupé’s new engine is a 2.0-litre TDI turbodiesel with the latest common rail fuel-injection technology to boost fuel efficiency.
Producing a healthy 168bhp and plenty of pulling power, the A5 2.0 TDI is available only with a manual gearbox initially, but front-wheel drive or Audi’s Quattro four-wheel drive is offered.
Front-wheel-drive A5 2.0 TDIs are claimed to average 53.3mpg and emit 140g/km of CO2; four-wheel drive reduces this to 47.9mpg and 156g/km, but slims the 0-62mph time by 0.1 seconds to 8.2 seconds. Both versions are able to reach 140mph.
Pricing for the new A5 2.0 TDI starts at £28,485 (£30,010 for Quattro).
Audi has also just introduced its S line specification for the A5, including sports suspension and styling extras; the A5 S line costs £2,250 over the standard specification.
Moving on to the Mazda6, the new engine here is a 2.2-litre MZR-CD tubodiesel, again using common rail technology.
The MZR-CD is available in three power outputs: 182bhp, 161bhp, and 123bhp – although not all versions may be coming to the UK.
According to official EU figures, the high power version returns average fuel economy of 50.5mpg (49.6mpg estate), with CO2 emissions of 149g/km (152g/km estate). Both lower-powered Mazda6 diesels offer 51.4mpg (50.5mpg estate), and 147g/km CO2 (149g/km estate).
The MZR-CD engine is more powerful than the Mazda6’s existing 2.0-litre diesel, improving performance – yet it is just as fuel efficient.
Full UK pricing will be announced soon. The first cars arrive in dealerships in January.
Car tax quandary?
If you want to find out how much car tax these new Audi and Mazda diesels will have to pay after the proposed changes to car tax take effect in April 2009, read our free car tax advice guide.
The latest car news and reviews
For daily consumer news, subscribe to the here. If you have an older web browser you may need to copy and paste this link into your newsreader: https://www.which.co.uk/feeds/reviews/news.xml . Find out more about RSS in the Which? guide to news feeds.
To check out our in-depth car reviews and reliability ratings for hundreds of new and used cars – including the VW Eos and other models in the Mazda range – log on to the Which? Car Buying Guide.