New figures from Clean Green Cars have revealed the most environmentally-friendly car manufacturers, and there’s good news for Toyota.

The Japanese carmaker fared well in the list, compiled by the independent automotive analysts, based on average CO2 emissions across the first quarter of 2010.

Surpassing the target figure of 130g/km, set by the European Union, Toyota’s mean average across its model range was 124.55g/km.

But there was huge disparity between its best and worst performing models. While its eco-friendly Prius registered 91.26g/km, the Landcruiser model was found to emit an average of 223.77g/km.

With an average of 393.2g/km, the Bentley Continental GT was the worst offender for emissions, followed by Land Rover’s Range Rover model, which recorded figures of 305.51k/gm.

The list also compares this year’s first-quarter performances with those of the final quarter of 2009, and the Mercedes CLS showed the highest increase in emissions, going up by 17.83 per cent.

But the Lexus RX showed a 25.17 per cent improvement, reducing its emissions from 197.85k/gm to 148.05k/gm.

A range of finely-tuned Lexus car parts have been created in order to allow engineers to build the most "driver-orientated" auto possible, it has been claimed.

The manufacturer’s production-ready LFA is due to be officially unveiled at the Tokyo motor show.

Buyers will be looking at paying about £336,000 for the vehicle and they will be able to choose from a range of options to personalise the model, including 30 varieties of paint finish.

Numbers are to be limited to 500 and a maximum of 20 will be built each month to try and ensure the highest possible standards.

Every V10 engine will be built by a single engineer, who will sign the finished product.

Lexus spokesman Haruhiko Tanahashi stated: "The LFA is a thoroughbred supercar, a machine engineered to achieve a single goal – to deliver a supreme driving experience."

Meanwhile, the manufacturer is also due to display its compact premium hybrid model – the LF-Ch – at the Tokyo motor show.

Some new Lexus car parts on the 2010 version of the GS 450h could help protect occupants of the vehicle while on the road.

The updated edition of the auto is to feature the manufacturer’s Pre-Crash Safety technology.

Buyers will find the front seats have been equipped with inflator-operated active headrests.

In the event of a rear-end collision, the support is projected forwards and upwards to reduce the chances of the driver or passenger sustaining whiplash injuries.

As well as these safety-related changes, the auto has also been given something of a facelift.

It has a new front grille, updated 18-inch alloy wheel design and an additional leather upholstery option.

The car will also be available in three extra colours – Vanilla Mist, Atlantic Blue and Richmond Green.

Meanwhile, the Lexus LS 600h has also been revised for 2010.

Changes include the introduction of an automatic headlamp high-beam system and new navigation technology.

A number of the car parts on the revised Lexus LS 600h have been improved, it has been claimed.

The manufacturer drew attention to the auto’s brakes, which have been updated to offer less vibration and quieter performance.

In addition, the changes are designed to ensure outstanding high-speed stopping power.

The products in question are 380 mm ventilated front disc brakes that were developed in partnership with specialist company Brembo.

Other revisions to the car include a new eco driving mode, redesigned seating and updated equipment.

According to Lexus, all these amendments help advance the vehicle’s comfort and performance.

The model was unveiled for the first time at the Frankfurt International Motor Show, which got underway this week.

Visitors to the German auto event will also be able to see the manufacturer’s LF-Ch full hybrid concept.

Lexus claimed this car has been created in response to growing demand for smaller, green models that still offer high levels of driving pleasure and refinement.

The powertrain on a new Lexus model offers excellent performance and outstanding green credentials, the manufacturer has claimed.

Due to be unveiled at the Frankfurt International Motor Show, the LF-Ch is a hybrid designed to be launched on the European premium compact market.

According to the carmaker, the vehicle’s powertrain is capable of the kind of performance demanded by customers looking for this type of auto.

However, it pointed out the model also boasts low CO2 and NOx emissions and impressive fuel consumption.

Motorists who opt for this car will find it can be driven in a full electric mode.

This choice is not always available on hybrids, but is suitable for busy urban environments.

When driven in electric mode, the LF-Ch releases no emissions and is extremely quiet, the manufacturer explained.

Earlier this year, What Car? magazine’s JD Power customer satisfaction survey named Lexus as the group offering the highest levels of driver contentment.

Lexus has announced it is unveiling a hybrid model this month that will meet the needs of even the "most demanding premium compact segment customers".

The LF-Ch is to make its world debut at the Frankfurt International Motor Show – taking place between September 17th and 27th.

According to the manufacturer, the fact the auto offers electric-only driving means owners will benefit from near silence when in urban areas, as well as zero emissions.

It also claimed the five-door car boasts "stylish design".

Further information regarding the model is due to be released in the coming days, before its official unveiling in Germany.

Meanwhile, the Frankfurt International Motor Show will also see Lexus display its revised LS and GS models.

In other news, it was recently revealed Humberside Police had chosen a Lexus IS-F in order to help them with their crime-fighting duties.

The force said it had opted for the model because it offers exceptional levels of stability, even at high speeds.