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‘Significant’ fuel economy gap to continue after introduction of WLTP

The gap between official MPG figures and real-world performance will remain significant despite regulatory change later this year.

Man filling car with fuel

Incorporating the use of air conditioning, the gap between official mpg figures and real-world EQUA Index Mpg has risen to 29% on average.

Although the World-Harmonised Light-Duty Vehicles Test Procedure (WLTP) will be introduced from 1 September this year to certify the carbon dioxide and fuel economy of cars, according to Emissions Analytics it will only halve the current variations between official and real-world fuel economy and not eliminate them altogether.

According to the vehicle emissions measurement company’s EQUA fuel economy data, thre was a five percentage point increase in the gap between official and real-world mpg in 2016, reaching 29%. This follows data published this week by mileage and expenses management specialist TMC that indicates the gap between diesel cars’ official and real-world fuel economy grew to 28% last year.

Emissions Analytics said that the WLTP standard will still be an improvement on the existing type approval process, which incorporates the New European Driving Cycle (NEDC), largely due to the removal or restriction of loopholes in the procedure. However, it added that “the test cycle itself is not much more representative of real-world driving, as it remains in the laboratory with no changes in elevation and still modest acceleration rates”.

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Natalie Middleton

Natalie has worked as a fleet journalist for 14 years, previously as assistant editor on the former Company Car magazine before joining Fleet World in 2006. Prior to this, she worked on a range of B2B titles, including Insurance Age and Insurance Day. Natalie works across the magazine portfolio and updates the company websites with daily news, interviews and road test content.

One Comment

  • Road tests confirm TMC audited MPG data10. Feb, 2017

    […] Hard on the heels of our report on ever less-accurate official MPG data, figures published  this week by Emissions Analytics (EA), a vehicle emissions measurement company, tally almost exactly with TMC’s. […]