2012 Infiniti M56 — Full Specifications
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The 2012 Infiniti M56 is a saloon/sedan powered by a 5.6L 8-cyl premium gasoline engine. Its most fuel-efficient configuration returns around 23 mpg (UK) / 19 mpg (US EPA) combined, with 22–23 mpg (UK) across all configurations. Owners often keep a Infiniti M56 workshop manual to hand for servicing and repairs.
Compared with the 2011 Infiniti M56: Fuel economy is essentially unchanged at around 23 mpg (UK) combined. The engine line-up listed by EPA is unchanged. It carries the same 4★ overall NHTSA rating.
Full Specifications
| Engine | 5.6L 8-cyl |
|---|---|
| Transmission | Automatic (S7) |
| Fuel Type | Premium Gasoline |
| Powertrain | Conventional |
| Drive | Rear-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 104 cu ft (2,945 L) |
| Luggage Volume (EPA) | 15 cu ft (425 L) |
| Fuel Economy (UK) | 23 combined / 19 urban / 29 extra-urban mpg |
| Fuel Economy (US EPA) | 19 combined / 16 city / 24 highway mpg |
| CO₂ Emissions | 291 g/km |
| EPA Est. Annual Fuel Cost | $4,350 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2012 Infiniti M56, all with the 5.6L 8-cyl engine. Combined fuel economy ranges from 18 to 19 mpg (US), or 22 to 23 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 |
|---|---|---|---|---|---|---|
| 5.6L 8-cyl | Automatic (S7) | All-Wheel Drive | 22 | 18 (16/23) | 307 | $4,550 |
| 5.6L 8-cyl | Automatic (S7) | Rear-Wheel Drive | 23 | 19 (16/24) | 291 | $4,350 |
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 104 cubic feet (about 2,945 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 2012 Infiniti M56
Running Costs: 2012 Infiniti M56
Covering around 8,000 miles a year in a 2012 Infiniti M56 at 23 mpg combined, expect roughly 1,581 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $4,350 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.
2012 Infiniti M56 Safety Ratings (NHTSA)
Recalls & Owner Complaints (NHTSA)
NHTSA lists 3 safety recall campaigns that include the 2012 Infiniti M56 (as of 6 October 2026). Most affected areas: Power train (2), Fuel system (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
- Power train — campaign 24V470000, reported 21 June 2024. Risk: A broken driveshaft can result in a loss of drive power, or a vehicle roll away when the vehicle is in park without the parking brake applied. Both scenarios can increase the risk of a crash.
- Power train — campaign 20V755000, reported 7 December 2020. Risk: A broken driveshaft can cause a loss of propulsion, increasing the risk of a crash, or may disable the parking brake, increasing the risk of a rollaway and injury.
- Fuel system — campaign 14V683000, reported 28 November 2014. Risk: A fuel leak in the presence of an ignition source could cause a vehicle fire.
Owners have filed 4 complaints with NHTSA about the 2012 Infiniti M56. The most-reported areas are Engine (2), Electrical system (1), Fuel/propulsion system (1).
Used-buyer checklist for the 2012 Infiniti M56
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Transmission & drivetrain (2 recall campaigns) — On the test drive, watch for hesitation, jerking or slipping between gears and ask for transmission service history.
- Fuel system (1 recall campaign · 1 owner complaint) — Ask whether any fuel-pump or fuel-system recalls were completed, and watch for hard starting or stalling.
- Engine (2 owner complaints) — Listen for unusual noise on a cold start, check for warning lights and ask for the service records.
- Electrical system (1 owner complaint) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
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
Infiniti models in our database average about 26 mpg (UK) combined on their most efficient configuration; the 2012 Infiniti M56's 23 mpg is 3 mpg below that make average. Its 291 g/km CO₂ figure is 28 g/km higher than the 263 g/km Infiniti average.
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 2012 Infiniti M56
Frequently Asked Questions
What engine does the 2012 Infiniti M56 have?
It's fitted with a 5.6L 8-cyl premium gasoline engine, paired with a automatic (s7) transmission.
What is the fuel economy of the 2012 Infiniti M56?
The most efficient configuration returns around 23 mpg (UK) combined, or 19 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 22 to 23 mpg.
How much does the 2012 Infiniti M56 cost to fuel per year?
The US EPA estimates about $4,350 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 2012 Infiniti M56 have a good safety rating?
It holds an overall NHTSA rating of 4 stars, with 4 stars for frontal crash protection.
Does the 2012 Infiniti M56 have any recalls?
NHTSA lists 3 safety recall campaigns that include the 2012 Infiniti M56 (as of 6 October 2026). Most affected areas: Power train (2), Fuel 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 2012 Infiniti M56?
Among the 4 owner complaints filed with NHTSA, the most-reported areas are Engine (2 complaints), Electrical system (1 complaint), Fuel/propulsion system (1 complaint). 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 2012 Infiniti M56 have?
EPA measures interior passenger volume at 104 cubic feet (about 2,945 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.