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...
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.
The 10 most fuel efficient executive and luxury cars
10. Mercedes-Benz E-Class E220d
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.
9. Volkswagen Passat 2.0 TDI 150
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.
8. Alfa Romeo Giulia 2.2D 180
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.
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