Mazda3 Fastback saloon - MPG, running costs & CO2

The Mazda3 Saloon only comes in 2.0-litre petrol form, which puts it at a disadvantage to the competition when it comes to choice. However, on paper, that single engine is a good one, with claimed economy that beats many smaller, harder-working engines in rival cars thanks to clever new technology.

Mazda3 Saloon MPG & CO2

A 183bhp, 2.0-litre Skyactiv X petrol is the sole engine option for the Mazda3 Saloon. Recently, it gained mild-hybrid electrical assistance (and a new e-Skyactiv X badge), which has boosted power from 178bhp and improved economy. Thanks to its strong power output, it never feels strained, yet the impressive 56.5mpg fuel consumption still feels possible in normal driving.

The Mazda3 Saloon has a six-speed manual gearbox as standard. You can choose a six-speed automatic but it’s best avoided unless you’ll be spending lots of time in stop-start traffic. It’s a little slower from 0-62mph than the manual gearbox and is noticeably less economical (not to mention more expensive to buy); you can expect up to 47.9mpg. With CO2 emissions of 135g/km, it’s several bands higher for company-car tax.

The manual manages a CO2 emissions figure of between 114-117g/km (depending on the wheel size you choose), which places the car in reasonable brackets for Benefit-in-Kind (BiK) company-car tax. The Mercedes A-Class Saloon in plug-in hybrid A 250 e guise will cost less in tax, though.

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Insurance groups

Choose the Mazda3 Saloon in Sport and Sport Lux and it occupies insurance group 22, while the GT Sport versions are rated one group higher.

Warranty

The Mazda3 Saloon comes with Mazda's 60,000-mile/three-year transferable warranty. There's a paint and surface corrosion warranty that also lasts for three years, regardless of mileage, and an anti-perforation warranty that lasts 10 years – also regardless of mileage.

Servicing

The Mazda3 Saloon will need servicing every 12,500 miles, or annually (whichever comes first). Dealers offer substantial savings on servicing costs with pre-paid plans; a three-year service plan costs £800 for the Skyactiv-X engine, and can be paid monthly or in one lump sum upfront.