True MPG: most efficient executive and luxury cars 2020

What Car?'s True MPG tests show what fuel economy you can really expect from a car. Here, we reveal the best and worst-performing executive and luxury cars we've tested...

True MPG: most efficient executive and luxury cars
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What Car? team
15 Mar 2019 11:40

The miles per gallon (MPG) figures published in sales brochures can tempt you into buying a particular car, but those results are often 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, we use strictly controlled laboratory conditions, but the tests are based on a real-world route that takes in town, rural and motorway driving.

The results reflect what's achievable if you’re driving gently and sticking to speed limits but aren’t resorting to any unrealistically slow acceleration or special 'hypermiling' techniques.

Here we reveal the 10 most efficient executive and luxury cars we've tested so far – plus the one that used the most fuel.

The 10 most fuel efficient executive and luxury cars

10. Mercedes-Benz E-Class E220d

2016 Mercedes-Benz E-Class E 350 d review

True MPG 44.8mpg

The E-Class offers a comfortable ride and a plush interior, plus this diesel version's comparatively low CO2 emissions and P11D value mean it's the one that makes most sense for company car drivers.

Volkswagen Passat Saloon 2019 front tracking

True MPG 45.4mpg

It can be a little gruff, but Volkswagen's latest 2.0-litre diesel engine otherwise impresses, pulling strongly across a wide rev range and delivering good real-world fuel economy.

Read our full Volkswagen Passat review or see what discounts are available

8. Alfa Romeo Giulia 2.2D 180

Alfa Romeo Giulia used 2016 - present

True MPG 45.7mpg

The 2.2-litre diesel engine in the Giulia could also be quieter, but it's even stronger and ever so slightly more efficient, while the Giulia itself is the best mainstream Alfa Romeo for years.

Read our full Alfa Romeo Giulia review or see what discounts are available

Next: the top 10 continued >

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