The current mpg tests are designed to provide you with a simple way of comparing the performance between new models. In order to do this accurately, the tests have to be carried out in exactly the same way, regardless of manufacturer, model or even the country in which the test was conducted. The only way the European Commission can ensure that manufacturers are all testing in the same way, is to stipulate the use of a rolling road test carried out in laboratory conditions. This keeps everything constant; ambient temperature, driving style and vehicle loading conditions to name a few.
With the tests conducted in this way, you will see some differences between the laboratory test and the real life performance. These differences could be better or worse than the published laboratory results depending on a number of factors. For more information on how the standard fuel consumption test is calculated, visit Fuel testing scheme.
If you feel that your Mazda is not performing as it should and that there could be a technical issue which is affecting fuel economy, please contact your Mazda dealer; or for advice on how to make improvements to your fuel economy, please visit Green driving tips.