From 06 April 2020, all official CO2 data for new cars is derived from the WLTP test cycle. Site currently being updated. Find out more >>

Official vs actual MPG gap increases in 2016

The difference between official and real-world fuel economy is getting wider according to research by Emissions Analytics, with the variance for 2016 standing at 26% on average.

With an official average fuel economy figure of 60.7 MPG the largest seen since the company started recording statistics back in 2011, the downside is that the gap between the quoted and actual results is also larger than ever, thanks to a real-world average of 44.1 MPG.

In 2015, the variance between actual and official figures was 21%, a slight decrease on 2014's results of 22% variance. Just four years ago in 2012 the difference was only 14%.

Emissions Analytics has also incorporated air conditioning into a separate set of results this year because of the fact that air-con is widely available in all sizes of car. With air conditioning switched on for 50% of the time, the variance is actually 29%, with an average fuel economy of 42.3 MPG compared to the year's 60.7 MPG.

The largest gaps found by Emissions Analytics exceed 40% though, a figure which increases to 75% for hybrid vehicles that have not had their battery charged and are running purely on the internal combustion engine.

With new test procedures set to begin this year - WLTP and RDE - Emissions Analytics expects that the variance will start to shrink to around half the current amount. There will still be a significant gap between official results and those found by drivers though.

Emissions Analytics data is now incorporated into the NGC Rating, helping to provide the most accurate and up-to-date real world emissions and fuel economy data available.

Image courtesy of Emissions Analytics

Find out more about fuel economy here

Chris Lilly

Author:Chris Lilly
Date Updated:2nd Feb 2017

Related news