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Tiscali are supporting the ACT ON CO2 campaign to help you reduce your CO2 emissions when you drive. By choosing a more fuel efficient model of the car you want you can potentially save yourself a quarter on fuel costs and reduce your CO2 emissions by up to 24%. Check out the best in CO2 car rankings to find out which top ten new cars have the lowest CO2 in their class.

Tip 1. Consider the car you want
In very general terms smaller cars tend to be more fuel efficient and emit less CO2 so ask yourself questions about what you want the car for. Do I really need six seats for a family of four? Could I make do with a smaller boot if I only use the car for shopping? You get the picture.

Tip 2. The engine matters
Once you've decided on the type of car check out the different makes, models and engine options. Most models offer a range of engines that vary in fuel efficiency and CO2 emissions.

Tip 3. Petrol or diesel?
Petrol and diesel engines have different effects on the environment. Engines powered by diesel generally produce less CO2, but more air quality pollutant emissions than their petrol counterparts. But which one should you choose? As a rule of thumb, if most of the driving you do is long distance or motorway driving then consider a diesel engine for fuel efficiency and lower CO2 emissions. On the other hand if you spend more time in town, where air quality is a greater consideration, then a petrol engine may be better suited.

Tip 4. Look for the label
Most new cars in a car showroom have a colour-coded fuel efficiency rating like fridges and washing machines. The coding is from band A to band G, with bands A and B representing cars that emit the least CO2 as well as having lower car tax. The lower the emission band, the lower the tax you'll pay. The label is also a guide to the running costs you can expect for that car over 12,000 miles so you can compare how much different cars cost to run.