What does g km mean car

This means that they generally have lower CO2 emission levels, making them cheaper to tax. For more than a decade, diesel cars have benefitted from lower car tax rates, thanks to their efficiency. This has helped to boost their popularity, but has also increased the level of other dangerous pollutants in the atmosphere, which are mainly produced by diesel engines. CO2 is not a direct risk to human health in the same way as other exhaust gases including nitrogen oxides and tiny pieces of soot called particulates.

But it is a greenhouse gas and its contribution to global warming is the reason why governments across the world are forcing car manufacturers to lower CO2 emissions. Reducing emissions from British vehicles is a major part of the government's plan to cut greenhouse gases in an effort to ensure that global warming does not cause temperature rises of more than 2C higher than pre-industral levels.

The tests are conducted in a laboratory and are designed to better reflect how cars are driven in the real world than the previous test, which dated back to the s. The WLTP test is divided into four parts with different average speeds: low, medium, high and extra high to replicate city, urban, countryside and motorway driving.

Each part contains a variety of driving phases, stops, acceleration and braking phases. The recent VW emissions scandal centred on the amount of harmful nitrogen oxides NOx produced by diesel-powered cars. It means that emissions and fuel consumption in the real world can be considerably higher than in the laboratory test.

BuyaCar team Aug 16, Car emissions Low-emission cars checker Car CO2 emissions explained. Share on Facebook Share on Twitter Share by email.

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These are calculated by the manufacturers using standardised tests so you can be reasonably confident that these are comparative between different cars. You can find out what this is for your new car by looking at the technical specifications of a vehicle and looking for the EC combined mpg Figure. In the UK there are 4. Taking an average of 12,miles a year, a fuel economy of Which seems pretty reasonable. Let's take another Ford that's in the top range and see what the difference is.

Click here to visit the VCA website. For more information, visit the www. The new owner must tax the car before driving away.

Let the DVLA know when you sell the vehicle as any remaining tax will be refunded to you. Head to the government website to find out more. Our Member Services Team are always happy to help. You can call them on or email us at [email protected]. Log-in Log-out. Everything you need to know about car tax bands 24th May Cars registered before 1 March If your car was first registered before 1 March , there are only two bands of car tax. Cars registered after 1 April The car tax regime for new cars changed after 1 April