2015 Mazda 6 — Full Specifications
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Running gear matters most — before anything else, UK: check tyre prices at TirendoUS: check wheel & tyre prices at WheelHero for this car's fitment.
The 2015 Mazda 6 is a saloon/sedan powered by a 2.5L 4-cyl regular gasoline engine. Its most fuel-efficient configuration returns around 36 mpg (UK) / 30 mpg (US EPA) combined, with 35–36 mpg (UK) across all configurations. Owners often keep a Mazda 6 workshop manual to hand for servicing and repairs.
Compared with the 2014 Mazda 6: Fuel economy is essentially unchanged at around 36 mpg (UK) combined. The engine line-up listed by EPA is unchanged. It carries the same 5★ overall NHTSA rating.
Full Specifications
| Engine | 2.5L 4-cyl |
|---|---|
| Transmission | Automatic (S6) |
| Fuel Type | Regular Gasoline |
| Powertrain | Conventional |
| Drive | Front-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 100 cu ft (2,832 L) |
| Luggage Volume (EPA) | 15 cu ft (425 L) |
| Fuel Economy (UK) | 36 combined / 31 urban / 44 extra-urban mpg |
| Fuel Economy (US EPA) | 30 combined / 26 city / 37 highway mpg |
| CO₂ Emissions | 185 g/km |
| EPA Greenhouse Gas Score | 7 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $2,250 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2015 Mazda 6, all with the 2.5L 4-cyl engine. Combined fuel economy ranges from 29 to 30 mpg (US), or 35 to 36 mpg (UK), depending on engine, transmission and drive. The headline figures at the top of this page describe the most fuel-efficient configuration.
| Engine | Transmission | Drive | MPG (UK) | MPG (US) | CO₂ g/km | Fuel cost / yr |
|---|---|---|---|---|---|---|
| 2.5L 4-cyl | Automatic (S6) | Front-Wheel Drive | 36 | 30 (26/37) | 185 | $2,250 |
| 2.5L 4-cyl | Manual 6-spd | Front-Wheel Drive | 35 | 29 (25/35) | 191 | $2,300 |
MPG (US) shows combined, with city/highway in brackets. Highlighted row = the configuration used for the headline figures. Source: US EPA fueleconomy.gov.
EPA measures interior passenger volume at 100 cubic feet (about 2,832 litres) and luggage volume at 15 cubic feet (about 425 litres). These are US EPA interior-volume figures; they are measured differently from the boot capacity numbers UK manufacturers quote.
Owner Essentials for the 2015 Mazda 6
Running Costs: 2015 Mazda 6
Covering around 8,000 miles a year in a 2015 Mazda 6 at 36 mpg combined, expect roughly 1,010 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $2,250 a year in fuel for the most efficient configuration (15,000 miles, national average prices). Work out exact fuel costs with the fuel cost calculator on 247Calculators.
Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.
Only need this car occasionally? See our buy vs rent comparison.
2015 Mazda 6 Safety Ratings (NHTSA)
Recalls & Owner Complaints (NHTSA)
NHTSA lists 3 safety recall campaigns that include the 2015 Mazda 6 (as of 6 October 2026). Most affected areas: Parking brake (1), Tires (1), Electrical system (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
- Parking brake — campaign 17V393000, reported 22 June 2017. Risk: If the parking brake actuator shaft binds, the parking brake may not engage or disengage fully. If the parking brake does not engage properly, the vehicle may move unexpectedly if it is parked on a slope,…
- Tires — campaign 14V675000, reported 27 October 2014. Risk: A vehicle that is driven with under inflated tires may experience a sudden tire failure, increasing the risk of a crash.
- Electrical system — campaign 14V173000, reported 3 April 2014. Risk: Once the PCM assumes that the charging system has failed, the vehicle will stop charging and could result in poor acceleration, loss of steering assist and windshield wiper operation, and a possible engine…
Owners have filed 60 complaints with NHTSA about the 2015 Mazda 6. The most-reported areas are Service brakes (15), Power train (8), Visibility/wiper (7). Complaints include 6 reported crashes, 2 reported injuries. That is close to the median of 60 complaints across the 12 Mazda 6 model years in our data.
Used-buyer checklist for the 2015 Mazda 6
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Brakes (1 recall campaign · 15 owner complaints) — Brake firmly from speed and look for pulling, vibration or a soft pedal; ask for brake service history.
- Tyres (1 recall campaign) — Check tyre age and wear and ask about any tyre recalls.
- Electrical system (1 recall campaign) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
- Transmission & drivetrain (8 owner complaints) — On the test drive, watch for hesitation, jerking or slipping between gears and ask for transmission service history.
Source: US NHTSA recall and consumer-complaint databases, retrieved 6 October 2026. Complaints are unverified owner reports, not confirmed defects. Check any vehicle by VIN at nhtsa.gov/recalls, and see our guide to checking a used car for recalls.
How It Compares
Mazda models in our database average about 34 mpg (UK) combined on their most efficient configuration; the 2015 Mazda 6's 36 mpg is 2 mpg above that make average. Its 185 g/km CO₂ figure is 13 g/km lower than the 198 g/km Mazda average.
Of the 12 Mazda 6 model years we cover, the 2015 is the most economical on its best configuration (36 mpg UK combined). See every Mazda 6 year side by side.
Last updated: · Data: US EPA (fueleconomy.gov) and NHTSA safety ratings 18 July 2026; NHTSA recalls and complaints 6 October 2026; Wikidata & curated EU catalogue 18 July 2026; European generation and engine data from Wikipedia 7 October 2026
Vehicle data sourced from manufacturer specifications. Always verify with your vehicle handbook or a qualified mechanic. This is a reference tool, not professional advice.
Recommended Accessories for the 2015 Mazda 6
Frequently Asked Questions
What engine does the 2015 Mazda 6 have?
It's fitted with a 2.5L 4-cyl regular gasoline engine, paired with a automatic (s6) transmission.
What is the fuel economy of the 2015 Mazda 6?
The most efficient configuration returns around 36 mpg (UK) combined, or 30 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 35 to 36 mpg.
How much does the 2015 Mazda 6 cost to fuel per year?
The US EPA estimates about $2,250 a year in fuel for the most efficient configuration, based on 15,000 miles of mixed driving and national average fuel prices. Your own cost will depend on mileage and local prices.
Does the 2015 Mazda 6 have a good safety rating?
It holds an overall NHTSA rating of 5 stars, with 4 stars for frontal crash protection.
Does the 2015 Mazda 6 have any recalls?
NHTSA lists 3 safety recall campaigns that include the 2015 Mazda 6 (as of 6 October 2026). Most affected areas: Parking brake (1), Tires (1), Electrical system (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
What are the most common problems reported for the 2015 Mazda 6?
Among the 60 owner complaints filed with NHTSA, the most-reported areas are Service brakes (15 complaints), Power train (8 complaints), Visibility/wiper (7 complaints). Complaints are unverified owner reports, not confirmed defects, and raw counts rise with how many cars were sold.
How much interior and luggage space does the 2015 Mazda 6 have?
EPA measures interior passenger volume at 100 cubic feet (about 2,832 litres) and luggage volume at 15 cubic feet (about 425 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.