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True MPG: best executive and luxury cars 2018

What Car?'s True MPG tests show what you can really expect from a car. Here we reveal the most efficient executive and luxury cars we've tested so far

Words By Claire Evans

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Efficient executive and luxury cars

The mpg figures published in sales brochures can tempt you into buying a particular car, but those results can be misleading. Fortunately, What Car?'s True MPG tests reveal what sort of fuel economy you can expect in the real world.

To ensure accuracy and repeatability, our tests are conducted under strictly controlled laboratory conditions but based on a real route that takes in urban, A-road and motorway driving.

Below, we take a look at the most efficient executive and luxury cars we've tested so far.

Best real MPG executive and luxury cars

8. Mercedes-Benz S 350 d

Official fuel economy: 50.4mpg; True MPG: 35.1mpg; Shortfall: 30.3%

The S-Class sets the pace for luxury saloon technology. More often than not, it’s the first model to feature the latest advance – on the latest version you can get suspension that uses windscreen-mounted cameras to monitor the road ahead and prepare the system for potholes. Its fuel-saving tech is up there with the best, too, hence the real-world 35.1mpg we achieved in it.

Watch our video review of the Mercedes-Benz S-Class

Read our full Mercedes-Benz S-Class review

Find a great Mercedes-Benz S-Class deal


7. Jaguar XF 3.0 V6 diesel

Official fuel economy: 51.4mpg; True MPG: 38.1mpg; Shortfall: 25.8%

The German triumvirate of Audi, BMW, and Mercedes-Benz, have dominated the large exec sector for many years with their respective A6, 5 Series, and E-class, models, but with the XF, Jaguar tackles them head on. Its six-cylinder diesel-engined model is our favourite because it offers seriously strong performance and reasonable fuel economy.

Watch our video review of the Jaguar XF

Read our full Jaguar XF review

Find a great Jaguar XF deal

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