In-depth Reviews

Mazda MX-5 roadster - MPG, running costs & CO2

SKYACTIV engine technology ensures the new Mazda MX-5 can put a smile on your face without breaking the bank

Carbuyer Rating

4.2 out of 5

Owners Rating

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MPG, running costs & CO2 Rating

4.0 out of 5

Mazda placed huge emphasis on low weight and low CO2 emissions when developing the Mazda MX-5, so it should be one of the cheapest sports cars to own. Over the years, the MX-5 has always been affordable to run, with good fuel economy as well as cheap parts and maintenance. Long-time fans will be pleased to know that the latest version continues the tradition.

Mazda MX-5 MPG & CO2

Out of the two engines, the 1.5-litre and 2.0-litre petrol engines, the smaller one is naturally more economical. The 1.5-litre engine can return up to 44.8mpg with emissions of 142g/km, while the larger 2.0-litre returns 40.9mpg with emissions of 155g/km. Every MX-5 costs £150 in annual road tax. These figures are pretty impressive and are thanks in no small part to the MX-5's lightweight construction. The extra 45kg of the RF’s folding metal hard-top roof doesn’t affect the car’s claimed fuel consumption and emissions figures.

Both engines use Mazda's SKYACTIV technology, which we tend to think does better at matching officially published fuel economy figures than the small turbo engines used by the likes of Fiat and Ford. Mazda’s ‘i-ELOOP’ fuel-saving technology was introduced to all models in the MX-5 range early on in 2020. This is made up of a new start-stop function as well as an energy recovery system to improve efficiency. The latter harvests energy under braking to help power the car's electrical systems.

Insurance group

Insurance won’t be cheap for any version of the latest MX-5. The entry-level model, with the 1.5-litre engine and a manual gearbox finds itself in insurance group 25, while a 2.0-litre engine lifts the SE-L model to group 31.


All new Mazdas are currently covered by a three-year/60,000-mile manufacturer’s warranty, a three-year surface-rust warranty for the paintwork and a 12-year guarantee against bodywork corrosion.


Mazda offers fixed-price servicing packages, which can be paid for up front in a lump sum or spread out over regular monthly instalments, so budgeting for maintenance should be relatively straightforward. Regular maintenance for the MX-5 shouldn’t cost significantly more than a family hatchback – however, regular enthusiastic driving is likely to increase tyre and brake wear and regular replacement of these items may prove expensive over time.

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