From later this year, drivers of Peugeot, Citroën and DS vehicles will be able to see what sort of real-world fuel economy they should expect from their vehicles thanks to a new online simulator.
The simulator is being billed as the first of its kind, and will allow consumers to show how their individual driving styles will affect the fuel consumption of their cars.
The three French brands, which make up Groupe PSA, have also published real-world fuel economy figures for 30 of their models. These results emphasise just how innacurate the industry's 'standard' tests - which are conducted in a lab and not on the open road - can be.
In the case of the Peugeot 3008 crossover, the 1.2-litre Puretech petrol version's fuel economy has dropped from an 'official' 57.6mpg to a real-world figure of 37.2mpg.
The DS 3 hatchback fitted with a PureTech 110 petrol engine, meanwhile, is said to return 47.0mpg under real-world conditions, when the industry's official figures suggest a figure of 65.7mpg.
Similarly, a Citroën C4 Picasso fitted with a BlueHDI 120 diesel engine is officially claimed to average 72.4mpg, but instead returns 43.4mpg in the real world.
In the wake of the Volkswagen emissions scandal last year, many car makers are keen to be transparent with potential buyers when it comes to fuel economy.
Peugeot, Citroën and DS's new fuel economy results are based on the European Union's Real Driving Emissions test, and involves driving on real roads as opposed to testing in a laboratory. To ensure its data is accurate, the three brands have also collected driving data from customer surveys.
Before the end of the year, Peugeot, Citroën and DS will also publish the real-world fuel economy figures for 20 more of their models.
Got a motoring question? Our experts are standing by to help, just tweet us your question using #askwhatcar
For all the latest reviews, advice and new car deals from What Car?, sign up to our weekly newsletter here