In-depth reviews

Kia Rio review - MPG, CO2 and running costs

The Rio offers decent fuel economy despite some old-tech powertrains, and the seven-year warranty should benefit residual values

Low running costs are often at the forefront of buyers’ minds when choosing a new supermini, and the Rio excels in that area. It's no longer the cheapest to buy, but it won’t cost the earth to fuel or maintain.

The entry-level 1.2-litre petrol engine manages a claimed 49.6mpg on the WLTP combined cycle and emits 128g/km of CO2 in 1 spec and 130g/km in 2 spec. The 99bhp 1.0-litre petrol fairs slightly better, managing 52.3mpg on the combined cycle (dropping to 50.4 for automatic models). CO2 emissions are 123g/km for manuals and 127g/km for autos. 

Mild-hybrid versions don’t bring the improvements in fuel economy and emissions some might expect. 3 grade manual and automatic models are both claimed to be capable of 52.3mpg (identical to some lesser-equipped Rios with no 48-volt hybrid system). A manual gearbox means emitting 122g/km of CO2 while an auto translates to 123g/km. 

Range-topping mild-hybrid GT-Line S models perform worse still. Again, the manual and automatic versions are claimed to come with the same fuel economy – 51.4mpg – and again the auto emits 1g/km more CO2 than the manual – 125 vs 126.

Insurance Groups

The Rio ranges from Group 4 to Group 9 for insurance purposes, so it'll be relatively cheap to insure. It is 1 and 2 grade models with the 1.2-litre petrol engine that sit in group 4, while 3 and GT-Line S models sit in group 9. 


The Rio's seven-year, 100,000-mile warranty is transferable between owners, which is a real selling point on the second-hand market. However, residual values of around 40 per cent are fairly average in the supermini class.

Most Popular

What are 4D number plates and are they legal?
number plates
Tips & advice

What are 4D number plates and are they legal?

Everything you need to know about so-called ‘4D’ number plates, including whether you’re allowed to have them on your car
25 Jan 2022
Best electric cars to buy 2022
Best electric cars
Electric cars

Best electric cars to buy 2022

There are more electric cars than ever to choose from, so we've picked some of the best you can buy in the UK now
10 Jan 2022
New 2022 Lamborghini Countach LPI 800-4 hits the road for the first time
Lamborghini Countach - front
Lamborghini Countach

New 2022 Lamborghini Countach LPI 800-4 hits the road for the first time

Lamborghini’s reborn Countach pictured on the move ahead of it arriving with customers
25 Jan 2022