True MPG: best family cars 2018

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

Words By Darren Moss

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4. Toyota Prius 1.8 VVTi

Official combined mpg 85.6 True mpg 50.5 % difference 41.0%

The Prius is, for many, the default choice in the hybrid market. And it's definitely recommendable, with strong fuel economy (even if it's not quite as strong as Toyota claims in the real world) and low company car tax all adding to its appeal. The Prius is also reasonably good to drive and is a perfect companion on traffic-packed urban streets.

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3. Seat Leon 1.0

Official combined mpg 64.2 True mpg 53.1 % difference 17.2%

This is the first of two outings for the Seat Leon in this list, and it's represented first in 1.0-litre petrol form. We've found it to be a flexible choice and ideally suited to city streets, but it's not as refined as some of the more powerful four-cylinder petrol engines on offer.

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2. Seat Leon 1.6 TDI 110 Ecomotive

Official combined mpg 78.5 True mpg 56.0 % difference 28.7%

When equipped with this 1.6-litre diesel engine, the Leon is punchy to drive. It has enough power to feel relaxed on the motorway, while CO2 emissions of 108g/km are competitive with key rivals.

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