In-depth reviews

Mazda CX-30 review - MPG, CO2 and running costs

Advanced engine technology helps boost the CX-30’s fuel economy and lower its emissions

Overall Auto Express Rating

4.0 out of 5

MPG, CO2 and running costs Rating

4.1 out of 5

£22,670 to £33,470
  • Stylish looks
  • Industry-leading safety rating
  • Great to drive
  • Rear space less than rivals
  • Small engine range
  • Limited luggage capacity

When it comes to low emissions and high fuel economy, it is the front-wheel-drive Skyactiv-X models that are the best CX-30s to go for. On a combined cycle, these are claimed to be capable of up to 47.9mpg, while emitting 133g/km of CO2. Adding an automatic gearbox worsens these figures to 43.5mpg and 146g/km of CO2. 

Incidentally, the economy numbers are identical to all-wheel-drive Skyactiv-X models with a manual gearbox. Change that for an auto and fuel economy drops to 40.4mpg and CO2 increases to 160g/km.

As for the lesser-powered Skyactiv-G variants, manual models are claimed to return 45.6mpg and emit 141g/km. Again, automatic models don’t perform as well – they only manage a combined fuel consumption of 42.6mpg and produce 151g/km of CO2.

We’ve tested the CX-30 with a Skyactiv-X engine a couple of times and achieved averages of between 40 and 41mpg. While below that of official numbers (which is normal), it compares favourably to a SEAT Ateca 1.5 TSI petrol and a Skoda Karoq 1.5 TSI petrol. The latter recorded an economy figure of 38.9mpg during a twin test with the CX-30. Diesel rivals promise better economy than the Mazda, but black-pump fuel is generally more expensive offsetting the difference.

Insurance groups

Entry-level Mazda CX-30s should cost the least to insure, sitting in group 12E. That said, the highest group any of the core models can sit in is 19E. Limited edition 100th Anniversary versions are slightly worse and qualify for group 21E. Interestingly, automatic gearboxes in some specs (for example SE-L Skyactiv-G) sit one group lower than the same trim with a manual transmission. 

How these groups compare to rivals varies. Premium models such as the Audi Q2 can sit in much higher insurance groups – as do some less upmarket rivals, such as the Peugeot 3008. At the same time, alternatives such as the Skoda Karoq can both undercut and exceed the CX-30’s insurance groups depending on trim. Even so, excluding performance SUVs, such as the Audi SQ2, most model ranges are roughly comparable with the Mazda on insurance costs. 


Our experts predict that the Mazda CX-30 will have strong residual values. For example, a manual two-wheel-drive SkyActiv-X GT Sport model is expected to retain around 52 per cent of its value after three years and 36,000 miles. This compared to a 1.5-litre Skoda Karoq TSI, which is expected to retain 46.8 per cent.

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