Skip advert
Advertisement

Kia Rio

New supermini claims great economy and CO2 without compromise

Kia is in a rich vein of design form. The Sportage crossover and Picanto city car should have prepared us for the new Rio, but the supermini still has the power to surprise. You could argue that it’s not as eye-catching or pretty as its stablemates, but the car’s neat proportions and muscular stance are attractive and modern. 

Advertisement - Article continues below

The ecoDynamics 2 model tested here doesn’t make any styling concessions, either. You can look as long as you like, but you won’t find any aerodynamic aids or specially designed wheels as you do on the Polo. The Kia’s body doesn’t sit closer to the ground to help it cut through the air more effectively, either; the only thing giving the game away is the badge on the tailgate.

Video: watch CarBuyer's video review of the Kia Rio

[[{"type":"media","view_mode":"content_narrow","fid":"68694","attributes":{"alt":"","class":"media-image"}}]]

Climb behind the wheel and the Rio’s eco credentials are even less apparent. In middle-of-the-range 2 trim, it comes with air-con, a USB port, Bluetooth connectivity, a leather-trimmed multifunction steering wheel and six airbags as standard. The Polo gets much less equipment.

It’s not just the number of toys on offer that impresses; the quality of the cabin materials and design is every bit as good. The layout is stylish but functional, the instruments are attractive and clear, and the smart rotary air-con controls and three-spoke steering wheel look great. 

Skip advert
Advertisement
Skip advert
Advertisement - Article continues below

Used - available now

CLA

2023 Mercedes

CLA

39,079 milesAutomaticPetrol1.3L

Cash £20,400
View CLA
Q5

2025 Audi

Q5

26,688 milesAutomaticDiesel2.0L

Cash £30,990
View Q5
Q5 Sportback

2025 Audi

Q5 Sportback

22,069 milesAutomaticDiesel2.0L

Cash £30,490
View Q5 Sportback
RS6 Avant

2023 Audi

RS6 Avant

25,923 milesAutomaticPetrol4.0L

Cash £84,985
View RS6 Avant

Legroom in the back is far better in the Kia. It has a near-flat rear floor and two adults can sit in the rear in comfort. Try this in the VW and you’ll find legs pressed into the front seatbacks. Lift the tailgates of our two contenders and the official measurements suggest they’re evenly matched. The Rio’s boot is only eight litres bigger than the VW’s, at 288 litres with the seats in place. 

Advertisement - Article continues below

The Rio extends its advantage out on the road. Its 1.1-litre three-cylinder diesel has a distinctive thrum, but it’s very refined, with none of the vibration evident in its rival. Of course, this is no performance car, but the Kia’s 74bhp output is more than adequate around town. And with a six-speed box instead of the VW’s five-speeder, the car feels more responsive on the open road. 

It’s not perfect, though. Standard 16-inch alloy wheels have an impact on the ride, sending jolts into the cabin over potholes and expansion joints. It can thump over uneven surfaces at low speeds, too, although body control is sharper in corners than the Polo’s and the Rio is more fun to drive along winding roads.

The Kia’s dynamic superiority even extends to its braking performance. Where its rival makes do with simple drum brakes at the rear, the Rio has discs all round. This made a difference to the stopping distances we recorded during our tests, with the Kia coming to a halt more quickly and with much less fuss from all speeds. 

Skip advert
Advertisement
Skip advert
Advertisement - Article continues below

These cars are more about low running costs than anything else, though – and this is usually where the Volkswagen comes into its own. But the Rio excels here, too. While it emits more CO2 than the Polo, it still sneaks beneath the 100g/km threshold. As a result, both cars are exempt from road tax and the London Congestion Charge. 

We couldn’t get close to Kia’s 74.3mpg claimed fuel economy figure, returning 45.6mpg. But bear in mind that this included our performance tests, and also that our car had only around 500 miles on the clock. Once the engine has loosened up its economy should improve, although the VW will always go further on a gallon of fuel.

What impresses most is the way the Rio goes about achieving its economy. Apart from its stop-start system and gearshift indicator, it’s hard to tell it’s an eco special from the driver’s seat. In the VW you’re constantly aware of its extra-long gear ratios and limited low-down torque, but the Kia doesn’t feel hamstrung by its efficient underpinnings.

So the Rio is a clean and economical supermini that’s also good to drive and great to look at. It also has loads of kit, a seven-year warranty and, above all, demands few compromises. As an eco car that will fit into any lifestyle, the Kia is an incredibly appealing choice.

Details

Chart position: 1
WHY: We love the new Rio. It looks good, has a practical, high-quality cabin and is attractively priced. New 1.1-litre diesel is frugal, too.

Skip advert
Advertisement

New & used car deals

Volkswagen Polo

Volkswagen Polo

RRP £14,480Avg. savings £2,084 off RRP*Used from £6,970
Hyundai Tucson

Hyundai Tucson

RRP £29,585Avg. savings £6,027 off RRP*Used from £13,795
Renault Clio

Renault Clio

RRP £16,160Avg. savings £3,075 off RRP*Used from £7,195
Nissan Qashqai

Nissan Qashqai

RRP £27,415Avg. savings £7,957 off RRP*Used from £11,276
* Average savings are calculated daily based on the best dealer prices on Auto Express vs manufacturer RRP
Skip advert
Advertisement

Most Popular

Peugeot is building a brand new petrol engine – who says ICE is dead?
New Peugeot ‘Turbo 100’ engine

Peugeot is building a brand new petrol engine – who says ICE is dead?

New 1.2-litre three-cylinder petrol engine to replace Puretech motors in Peugeot and more
News
16 Mar 2026
New Rivian R2 details revealed: UK specs, range and pricing for Tesla Model Y rival
Rivian R2 - front tracking

New Rivian R2 details revealed: UK specs, range and pricing for Tesla Model Y rival

The cutting-edge electric family SUV is coming to the UK – but in 2028 at the earliest
News
16 Mar 2026
Long-term test: Toyota Prius Excel
Toyota Prius Excel - header with charging cable

Long-term test: Toyota Prius Excel

First report: Surprises galore as Mk5 version of hybrid pioneer joins fleet
Long-term tests
15 Mar 2026