Mazda3 Fastback saloon - MPG, running costs & CO2

The Mazda3 Fastback has an economical engine, but the automatic gearbox is best avoided

Carbuyer Rating

3.9 out of 5

Owners Rating

3.8 out of 5

Read owner reviews
MPG, running costs & CO2 Rating

3.5 out of 5

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.

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.

Recommended

Mazda3 Saloon review
Mazda3 Saloon
Mazda3 Fastback saloon
18 May 2022

Mazda3 Saloon review

Most Popular

Best new car deals 2022: this week’s top car offers
MG HS
Deals
12 Aug 2022

Best new car deals 2022: this week’s top car offers

Top 10 best electric family cars 2022
MG ZS EV - front
Best cars
8 Aug 2022

Top 10 best electric family cars 2022

Nissan Ariya vs Volvo XC40 vs Volkswagen ID.4 - which is best?
Hero image
News
11 Aug 2022

Nissan Ariya vs Volvo XC40 vs Volkswagen ID.4 - which is best?

Tips & advice

View All
Car dashboard warning lights: the complete guide
Car dashboard symbols and meanings
Tips and advice
23 Mar 2022

Car dashboard warning lights: the complete guide

Electric car charging stations: a complete guide
Electric car charging station
Tips and advice
5 Nov 2021

Electric car charging stations: a complete guide

PCP vs HP – which type of car finance is right for you?
PCP vs HP
Car buying
17 May 2022

PCP vs HP – which type of car finance is right for you?

Average speed cameras: how do they work?
Average speed cameras: how do they work?
Tips and advice
20 Jun 2022

Average speed cameras: how do they work?

Best cars

View All
Top 10 best car interiors 2022
Peugeot 208 hatchback
Best cars
25 Jun 2021

Top 10 best car interiors 2022

Top 10 best electric cars 2022
Ioniq 5
Best cars
12 Jul 2022

Top 10 best electric cars 2022

Top 10 best cheap-to-run cars 2022
Nissan Leaf front
Best cars
12 Jul 2022

Top 10 best cheap-to-run cars 2022

The UK's top 10 fastest hot hatchbacks 2022
Audi RS 3 driving - front view
Hot hatches
24 Jun 2022

The UK's top 10 fastest hot hatchbacks 2022