The What Car? True MPG team takes a range of new cars for a thorough road test every week, using special equipment to measure their emissions. Unlike Government data that comes from a laboratory test, our tests show you indicative real-world MPG figures.
The latest models added to the True MPG database include the latest executive saloons from Audi, BMW, Lexus and Mercedes-Benz. All four were tested with an automatic gearbox and apart from the Lexus's petrol-electric hybrid setup a four-cylinder diesel engine.
The official figures for these cars are more than 60mpg, but can the saloons match this is our real-world test?
The BMW 320d Efficient Dynamics is our reigning Executive Car of the Year. It managed a respectable 53.2mpg in our tests, although this is still a 15.7mpg deficit on its lofty 68.9mpg official figure.
The 320ds result beats the new Audi A3 Saloon's; the 148bhp 2.0 TDI Sport model achieved 48.3mpg in our test, 14.5mpg down on the claimed economy of 62.8mpg.
The Mercedes CLA 220 CDI has the same official economy as the A3 Saloon, but it performed slightly better in our test its 50.0mpg was 12.8mpg lower than the claimed figure.
The most fuel-efficient saloon of the bunch was perhaps unsurprisingly the hybrid. The new Lexus IS300h claims 65.7mpg in Government figures, but our technicians recorded 54.6mpg from its petrol engine mated to an electric motor.
Visit whatcar.com/truempg to see the full range of cars weve tested, and find out what you really can expect to achieve on UK roads.