News

Manufacturer MPG discrepancies uncovered

21/03/2018

Manufacturer MPG discrepancies uncovered

Recent falls in oil prices will be a welcome relief for UK motorists as data shows drivers could be burning through as much as 75% more fuel than stated by manufacturers.

Carly Connected Car has released data collected from over one million vehicles, including 150,000 from the UK. The data shows year-on-year growth of discrepancies in fuel consumption in every new model generation since 2004, up until 2017 where the difference appears to reduce slightly.

The most significant difference was found in diesel cars from 2016, achieving an average of 75% higher consumption rates than stated in information given by the vehicle manufacturer. According to the RAC Foundation, the average given MPG for a diesel car in 2016 was 62.5mpg. For a motorist driving 12,000 miles, this would be a cost of £1,087.55 per annum (based on current diesel costs of 124p per litre). Considering the discrepancies found by Carly, this figure could instead be £1903.21, an additional cost to the motorist of £815.66 a year.

Overall, Carly uncovered discrepancies were greatest in the three most popular vehicle segments in the UK; small cars, compact cars and SUVs.

The Carly app found drivers of small cars are using as much as 55% more diesel and 35% more petrol than the official figures, adding hundreds of pounds to annual running costs. For compact car drivers the real-life diesel consumption recorded as 45% higher than manufacturer figures with the news no better in the increasingly popular SUV segment; burning through 45% more diesel and 40 per cent more petrol than owners might expect. The only segment of vehicle where manufacturer data reflected real-world results was Diesel sports cars where real world figures reflected the official data.

'There is an ongoing conflict of interest regarding fuel consumption. Over the years the regulations require less and less CO2 emissions, however, drivers want more powerful and luxurious vehicles,' said Avid Avini, one of Carly's founders. 'With each new C02 reduction strategy, manufacturers have had to reduce fuel consumption, however due to tests being carried out in laboratories rather than the real-world, the data shows consumption to be improving. Miles per gallon is one of the key concerns of UK drivers when buying a car as the on-going vehicle running costs can have huge impact on monthly budget. While it can be difficult for manufacturers to predict consumption, as it is very much dependent on individual driving style, a discrepancy of this size is of concern to consumers relying on manufacturer figures.'


Filed Under

We have placed cookies on your device to give you the best possible experience. By continuing to browse our site, you agree to our use of cookies. To find out more, please refer to our Privacy Policy

×

Find an Engineer

To find an engineer please enter your postcode below

Enter Postcode

Search
Assessor Mag
Assessor Logo

The members magazine of the IAEA.

Published bi-monthly, it covers news, features, case studies, interviews and reports from IAEA meetings across the country to keep members up-to-date with what's happening around the industry. You can read the latest issue online, and also access previous editions by clicking on the relevant links.

Assessor Magazine
Footer Logo

Subscribe to our mailing list

Subscribe

Terms & Conditions | Privacy Policy
copyright 2016 The Institute of Automotive Engineer Assessors