New cars A-Z

Key car stats, from Abarth to Zenos

Between the various figures produced on the old-style ‘NEDC’, transitional ‘NEDC correlated’ and new-style ‘WLTP’ lab emissions and fuel economy tests, it’s become tricky to compare manufacturers’ claimed efficiency on the latest new cars. When you see a fuel economy and CO2 figure reference elsewhere, it’s often without explanation.

So, to provide as fair and clear a basis for comparison as possible, you’ll only ever read ‘WLTP combined’ fuel economy and CO2 figures in Autocar’s first drive reviews, features and comparison tests – and on these data pages. Those are the aggregated result of four lab tests carried out across as many different cruising speed ranges – although they’re sometimes expressed as a range rather than as one specific figure to show the different results recorded by the heaviest and lightest available examples of the car in question (depending on optional equipment). Not all car makers have published these figures yet, however.

In road tests, you’ll also see our own independently produced real-world fuel economy test results for comparison with the lab test claims. We produce an ‘average’, ‘track’ and ‘touring’ figure for each car we test – as often as possible on a brim-to-brim test basis. While ‘average’ represents the overall economy returned by a new car over a full road test, and ‘track’ is relevant only to intensive performance testing (the length and conditions of which can vary slightly), ‘touring’ gives the best guide of the kind of economy you might see from a car at a steady 70mph UK motorway cruise.

We do real-world efficiency and range testing on electric cars, too, expressing the former in terms of miles per kilowatt hour, as EV manufacturers do increasingly widely by convention.