The most efficient family cars - and the least

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 family hatchbacks...

The mpg fuel economy figures published in sales brochures can tempt you into buying a particular car, but those results are often misleading, even with the newer, stricter WLTP regulations now in force.Image 1 of 22

Fortunately, What Car?'s True MPG tests reveal what sort of fuel economy you can actually 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 family cars we've tested so far – plus the one that used the most fuel.