Saab will launch a revised 9-3 range this autumn that includes a low emission model producing 119g/km - good, if not as impressive as the 109g/km of the recently launched BMW 320d Efficient Dynamics.

Citroen has revealed the next version of its Ford Focus-rivalling C4, which it claims will be able to teach you how to save fuel.

Underinflated tyres cost UK's drivers £440m a year

London mayor Boris Johnson has finally announced plans to change the system that allows cars to travel through the capital's congestion charge zone for free, while scrapping the western area of the zone and increasing the daily charge to £10.

Renault has released a new version of the Clio, called eco2 that achieves CO2 emissions of just 98g/km and fuel consumption of 76.

Toyota has agreed to buy a £35m stake in Tesla as the two companies struck a deal to cooperate on the development of electric car technology.

Land Rover has confirmed that diesel hybrid technology will feature in its flagship Range Rover by 2012.

Toyota has announced the second hybrid in its range, the Auris Hybrid, will cost from £18,950 when it goes on sale from July.

Nissan will sell its Leaf electric car for £23,350 after the government's £5,000 subsidy has been taken into account.

The new government has announced it will introduce a nationwide network of charging points for electric and plug-in hybrids as part of the coalition deal announced by the Conservatives and the Liberal Democrats.

Land Rover has announced plans to build two-wheel drive models for the first time in its history.

The lowest emitting Seat Ibiza is now the estate version, the ST, which boasts a CO2 rating of 94g/km, with the new cleaner engines set to join the range later this year.

At an event at the O2 arena Nissan announced more details of the Leaf which will go on sale in 2012.

BMW's i Project Megacity electric car will be launched in 2013.

Renault's mid-range electric saloon, the Fluence, will launch at the end of next year in the UK with a price tag expected to sit between £20,000 and £25,000.

BMW is looking for 20 people willing to lease a Mini E in phase two of its electric car consumer trials.

The headline number for the latest Lotus Elise is not its 0-60 time or top speed, but, amazingly, its emissions rating and fuel economy.

Vauxhall is fast-tracking the development of a pure electric version of the new city car that it has under development.

Citroen has tweaked the entry-level diesel engine in its Ford Mondeo-rivalling C5 to bring down emissions and improve the fuel economy.

A British company is launching the first electric scooter to be powered by a detachable lithium ion battery that can be taken indoors to charge.