In-depth reviews

Mazda CX-30 SUV - MPG, running costs & CO2

Both petrol engines have the ability to return a decent economy figure

Carbuyer Rating

4.0 out of 5

MPG, running costs & CO2 Rating

4.0 out of 5

Mazda has a reputation for clever engineering and the Mazda CX-30 is no different, featuring the world's first petrol engine with compression ignition - a technology first developed for diesel engines and branded Skyactiv-X. The idea is to give the range-topping CX-30 the driver appeal of a petrol but with fuel-efficiency that competes with its most frugal rivals.

Such advanced tech comes at a premium though, so a straightforward petrol Skyactiv-G is also available lower in the range. After initially offering the CX-30 with a Skyactiv-D diesel engine, Mazda withdrew it from sale in late 2019, making the CX-30 petrol only.

Mazda CX-30 MPG & CO2

If you're looking for a petrol compact SUV, the Mazda CX-30 is among the most affordable to run on the market. Even the less powerful but thirstier Skyactiv-G 2.0-litre petrol can manage a respectable 45.6mpg when smaller wheels, front-wheel drive and a manual gearbox are fitted. However, middling CO2 emissions are unlikely to make it popular with company-car drivers.

Mazda's SkyActiv-X engine is also 2.0 litres, but uses clever engineering to produce more power with less fuel and cleaner tailpipe emissions, resulting in CO2 emissions of 133g/km for the front-wheel drive model with a manual gearbox and 47.9mpg. However, it's worth noting the figures can drop to a less impressive 40.4mpg and 160g/km for the four-wheel-drive SkyActiv-X model with an automatic gearbox.

Every Mazda CX-30 will cost £140 a year in road tax, and Mazda owners have told us that servicing and maintenance is reasonably priced.

Insurance groups

Insurance groups for the Mazda CX-30 are reasonable, starting from 12 out of 50 for the entry-level SE-L SkyActiv-G version. The same specification with the more powerful SkyActiv-X engine takes this up to group 18, the same group as the top GT Sport Tech model.


Mazda models come with a three-year, 60,000-mile warranty. This matches models from Ford and Volkswagen, but is underwhelming next to the five-year warranties offered by Toyota and Hyundai.


Typical service intervals for Mazda models sit 12,500 miles apart, or annually, depending on which comes first. Servicing plans can cover routine maintenance with one upfront payment, or spread out monthly.

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