There can be large variations in the level of carbon dioxide emitted by cars within the same market category, and even by the same model of a car registered in different years.
The handy search tool below allows you to compare the energy efficiency of new and used cars registered since 2001. You can search either by the size of car, or by a particular make and model.
Click on the appropriate tab to switch between searching by vehicle size or by make and model. Then select your option from the drop down list.
Note: if viewing on a mobile device please swipe left to see the full table.