Parkers overall rating: 4.1 out of 5 4.1

Miles per pound (mpp) Miles per pound (mpp)

Hybrid petrol engines 13.1 - 13.4 mpp
Plug-in hybrid petrol engines 52.9 - 54.8 mpp
Low figures relate to the least economical version; high to the most economical. Based on WLTP combined fuel economy for versions of this car made since September 2017 only, and typical current fuel or electricity costs.
Based on "Weighted" mpg; figures depend on the proportion of miles driven in pure electric mode and may vary widely

Fuel economy

Hybrid petrol engines 61.4 - 62.8 mpg
Plug-in hybrid petrol engines 247.8 - 256.8 mpg
  • Impressive efficiency, though not top of the class
  • Plug-in hybrid could cost mere pennies to run
  • Hybrid best choice if you can’t plug in

Whether you opt for the Ioniq Hybrid or Plug-in Hybrid should depend on your own situation. Both have advantages in terms of running costs, but it’s important not to simply be suckered in by the published numbers…

On paper, the Plug-in Hybrid seems like a total no-brainer. It claims to offer up to a staggering 256.8mpg and CO2 emissions of just 26g/km. However, the nature of the testing procedure means that you could see far more than this – or far less. It just depends on how you use the car.

The plug-in hybrid is capable of a pure-electric range of a little less than 40 miles. Naturally, this means that if all of your journeys shorter than this, you’ll never have to trouble the petrol engine – theoretically giving you unlimited mpg.

Longer journeys, however, will see the mpg figure reduce. This is because once the battery is depleted, the Ioniq Plug-In just becomes a petrol car – but one that has to carry round a heavy battery pack and motor. So on long journeys, or day-to-day use without plugging in, it won’t be very efficient.

2020 Hyundai Ioniq plug-in

Most owners are likely to split the difference, but we wouldn’t recommend buying the Ioniq Plug-In unless you know you have somewhere – at home or at work – to regularly plug in. Hyundai claims a charging time – to 80 per cent – of just over two hours. Charging from a three-pin socket is only recommended in emergencies but should take around six hours.

If this isn’t the case – and for city dwellers, those who live in flats or just those without off-street parking, it may not be – then the Hybrid is a good compromise. With a smaller, and therefore lighter battery pack, it will provide similar fuel economy regardless of whether you’re undertaking a long journey or a short hop through town.

The Hybrid claims fuel economy figures of up to 62.8mpg, which is a little down on the 68.4mpg you’ll see from the most efficient Toyota Prius. Our time with an Ioniq Hybrid saw an mpg figure in the low 50s across several hundred miles of mixed roads. CO2 emissions are pegged at a low 85g/km.


  • Hyundai has a good record with reliability
  • Electric cars have fewer moving parts
  • Long warranty provides further peace of mind

We're not hearing any negative feedback from owners with their part-electrified hatchbacks. But we’ve reason to be optimistic: Hyundai has actually been selling hybrids in Korea and the United States for some years – so it has deep experience of battery-powered cars.

To further reassure buyers, Hyundai offers the same five-year unlimited mileage warranty as the rest of its range on the Ioniq.

Ongoing running costs

Road tax (12 months) £0 - £140
See tax rates for all versions
Insurance group 10 - 12
How much is it to insure?