New MPG Test Means More Realistic Fuel Consumption Figures
This coming September, the way that new cars fuel cunsumption is tested will change. The new testing method - called WLTP - is designed to test cars under more realistic driving conditions to achieve more realistic mpg figures.
From September 2017, any brand new vehicles reslease to market will be subject to the new WLTP (Worldwide Harmonised Light Vehicles Test Procedure). Pre-models on sale will have a period of grace until September 2018 before they have to have passed the new test and be certified.
Even though the WLTP will be more indicative of real world driving, it will still be lab-based. Meaning that it still won't account for variations in weather conditions, car occupancy and traffic - all of which have a huge effect on fuel economy.