True MPG: most and least efficient family 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 family hatchbacks...

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Steve Huntingford
01 February 2019

New Hyundai Ioniq vs used BMW 330e

4. Hyundai Ioniq Plug-in

True MPG 51.8mpg

The Hyundai Ioniq is available as a fully electric car, a conventional hybrid and this plug-in model, which can travel almost 40 miles on electric power before its petrol engine needs to cut in. However, even with the batteries flat at the start of the test, it's efficient enough to take fourth place on our family car list.

Read our full Hyundai Ioniq review, or see what discounts are available

3. Seat Leon 1.0 TSI

True MPG: best family cars 2018

True MPG 53.1mpg

This is the first of two appearances for the Seat Leon. We've found its turbocharged 1.0-litre engine to be ideally suited to city streets and reasonably punchy on faster roads, but it's not as refined as some of the more powerful four-cylinder petrol engines on offer.

Read our full Seat Leon review, or see what discounts are available

2. Seat Leon 1.6 TDI 110 Ecomotive

Seat Leon FR vs Vauxhall Astra SRi

True MPG 56.0mpg

When equipped with a 1.6-litre diesel engine, the Leon performs well from low revs, so you don't have to make too many gearchanges. It makes the Leon a particularly relaxing motorway companion.

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