True MPG: most and least efficient executive and luxury cars

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...

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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, our What Car? 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 drive gently and stick to speed limits, but don't resort to unrealistically slow acceleration or special 'hypermiling' techniques.

Find out more about how we test for True MPG >>

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

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