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How to use the data
It may be helpful to note the following:
- Models are listed under the name of the manufacturer or importer;
- The figures are obtained by running an example of the listed vehicle over a fixed route in a laboratory on a rolling road under closely controlled conditions. The test cycle is described elsewhere in this guide;
- The results of the fuel consumption tests are shown both in litres per 100 kilometres (l/100km) and in miles per gallon (mpg). A conversion chart and conversion factors are given at the end of this guide;
- CO2 emissions are shown in grams per kilometre (g/km). The other results of the exhaust emissions test are shown in milligrams per kilometre (mg/km);
- The cost of driving 12000 miles is calculated using the official combined fuel consumption figure and fuel prices which are assessed each year. Currently they are 130p/litre for petrol, and 134p/litre for diesel and 63p/litre for LPG (no fuel figures are available at this time for CNG). The electricity cost of driving 12000 miles is calculated using the electric energy consumption and an electrical cost per unit price, also assessed each year, currently this is 16.3p/kWh. A description of the calculation can be found in the Glossary of Terms. Note that, as indicated above, the official fuel consumption figures, and hence these cost figures, are for comparative purposes and actual fuel consumption and cost on the road may vary from this;
- The external noise emitted by a car is shown in decibels as measured on the A-weighted scale of a sound level meter (dB (A)). The A scale was devised to 'weight' the reading of a sound level meter so it more closely represented what is heard by the human ear.
- It is important to note that test figures shown in the guide are for comparison of different models and will not necessarily be the same as the fuel consumption, emissions levels, or noise levels actually achieved on the road. For this reason it is not advisable to rank a number of vehicles for which very similar figures are quoted;
- The test to test variability in type approval local pollutant emission figures means they are of only limited value in comparing vehicles and caution should be exercised when considering these figures. More detail is given later in this guide;
- CO2 Information - The CO2 figures shown are representative of the vehicle tested and may vary between specifications (variants or versions) of a given model. As such the figures are indicative only.