PSA Group, parent company of French car brands Peugeot Citroen and DS, released initial findings from its own real-world fuel economy tests earlier this month. The data revealed that some models are thirstier than official figures by as much as 40% under realistic driving conditions, and that every one of the 28 core models put under scrutiny exceeded official figures by more than 23%.
The company said it published the data to be more “transparent” with its customers. It added that it decided to act in the wake of “collapsing consumer confidence in car testing” following last year’s dieselgate scandal, in which German manufacturer Volkswagen admitted installing systems designed to make some of its vehicles perform better while being tested than during ordinary driving.
The biggest shortfall in economy uncovered so far by the PSA Group tests concerned the Citroen C4 Picasso people carrier, when equipped with a 120 horsepower BlueHDi diesel engine with stop-start facilities, 6-speed automatic transmission and 17-inch wheels. The official combined cycle score for this spacious five-seater is an impressive 72.4mpg whereas the real-world measurement came in at 43.4mpg – worse by a whopping 29mpg or 40.1%.
The car with the smallest measured discrepancy in the sample was a Peugeot 2008 compact crossover, fitted with a 1.2-litre 82 horsepower PureTech petrol engine, five-speed manual gearbox and 16-inch wheels. Real-world testing resulted in economy of 44.1mpg, or 23.4% worse than the model’s 57.6mpg official combined cycle rating.
The average across the cars tested – 14 Peugeot, 11 Citroen and 3 DS models – revealed consumption 31% above the combined cycle figure. In practice, this means customers will need to pay for about a third more fuel when driving the cars tested than might be expected from official consumption figures. The full table of model-by-model results is included below.
PSA Group’s results were recorded using a standardised test procedure established by two non-governmental organisations: Brussels-based Transport & Environment (T&E) and Paris-based France Nature Environment (FNE). The tests were overseen by inspection and certification specialist Bureau Veritas.
The approach used was based on the EU’s upcoming Real Driving Emissions (RDE) procedure, which will become the official means to measure tailpipe pollution from September 2017.
A portable emissions measurement system (PEMS) was attached to each vehicle being tested, which was driven on public roads for defined stretches of 25km (15.5 miles) under urban conditions, 39km (24.2 miles) on rural roads and 31km (19.2 miles) at motorway speeds. The test cars were loaded with passengers and luggage, made use of air conditioning and experienced a variety of road gradients and surfaces, PSA Group stated. It described the test procedure as “scientifically robust, reproducible and representative of a typical driver”.
The company has committed to publish the tests of another 20 models by the end of the year, and to expand the available data to include emissions of harmful NOx gases. It has also pledged to develop a facility on its website for customers to provide details of their own car usage so that they can receive personalised predictions of real-world consumption and emissions.
|108 1.2l PureTech 82 M5 15” tyres||46.3||65.6||19.3||29.4%|
|2008 1.2l PureTech 110 S&S EAT6 16” tyres||39.7||58.8||19.1||32.5%|
|2008 1.2l PureTech 82 M5 16” tyres||44.1||57.6||13.5||23.4%|
|2008 1.6l BlueHDi 100 M5 16” tyres||55.3||76.3||21||27.5%|
|2008 1.6l BlueHDi 120 S&S M6 16” tyres||54.2||76.3||22.1||29.0%|
|208 1.6l BlueHDi 100 M5 16” tyres||60.1||80.7||20.6||25.5%|
|208 1.6l BlueHDi 120 S&S M5 16” tyres||60.1||94.1||34||36.1%|
|3008 1.2l PureTech 130 S&S M6 17” tyres||37.1||57.6||20.5||35.6%|
|3008 1.6l BlueHDi 120 S&S M6 17” tyres||46.3||68.8||22.5||32.7%|
|308 1.2l PureTech 110 S&S M5 16” tyres||44.8||70.6||25.8||36.5%|
|308 1.2l PureTech 130 S&S M6 16” tyres||42.8||61.4||18.6||30.3%|
|308 1.6l BlueHDi 120 S&S M6 16” tyres||57.6||88.2||30.6||34.7%|
|508 2.0l BlueHDi 180 S&S EAT6 17” tyres||44.8||70.6||25.8||36.5%|
|PARTNER 1.6l BlueHDi 120 S&S M5 15” tyres||46.3||65.6||16.3||24.8%|
|Berlingo BlueHDi 100 M 15” tyres||46.3||65.6||19.3||29.4%|
|C1 PureTech 82 M Feel 15” tyres||46.3||65.6||19.3||29.4%|
|C3 BlueHDi 75 S&S M 15”tyres||57.6||94.1||36.5||38.8%|
|C3 Picasso BlueHDi 100 M Confort 16” tyres||49.5||74.3||24.8||33.4%|
|C3 PureTech 82 M Exclusive 16” tyres||44.8||61.4||16.6||27.0%|
|C4 BlueHDi 100 M Feel 16” tyres||55.3||78.4||22.7||29.0%|
|C4 Cactus BlueHDi 100 M Shine 16” tyres||55.3||78.4||23.1||29.5%|
|C4 Cactus PureTech 110 S&S M Shine 16” tyres||46.3||65.6||19.3||29.4%|
|C4 Picasso BlueHDi 120 S&S EAT6 Intensive 17” tyres||43.4||72.4||29||40.1%|
|Grand C4 Picasso BlueHDi 120 S&S M6 Attraction 16” tyres||49.5||70.6||21.1||29.9%|
|Grand C4 Picasso PureTech 130 S&S M6 Intensive 17” tyres||38.1||56.4||18.3||32.4%|
|DS 3 BlueHDi 120 S&S M6 Sport Chic||56.4||78.4||22||28.1%|
|DS 3 PureTech 110 S&S M So Chic||47||65.6||18.6||28.4%|
|DS 4 PureTech 110 S&S M So Chic||52.3||74.3||22||29.6%|
By Lem Bingley