2018 Infiniti Q50 Hybrid — Full Specifications
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The 2018 Infiniti Q50 Hybrid is a saloon/sedan powered by a 3.5L 6-cyl premium gasoline engine. Its most fuel-efficient configuration returns around 35 mpg (UK) / 29 mpg (US EPA) combined, with 34–35 mpg (UK) across all configurations. Owners often keep a Infiniti Q50 Hybrid workshop manual to hand for servicing and repairs.
Related listing: see also the 2018 Infiniti Q50 page for the base Q50 listing, which may cover additional engines and body styles.
Compared with the 2017 Infiniti Q50 Hybrid: Fuel economy is essentially unchanged at around 35 mpg (UK) combined. The engine line-up listed by EPA is unchanged.
Full Specifications
| Engine | 3.5L 6-cyl |
|---|---|
| Transmission | Automatic (S7) |
| Fuel Type | Premium Gasoline |
| Powertrain | Hybrid |
| Drive | Rear-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 100 cu ft (2,832 L) |
| Luggage Volume (EPA) | 9 cu ft (255 L) |
| Fuel Economy (UK) | 35 combined / 32 urban / 38 extra-urban mpg |
| Fuel Economy (US EPA) | 29 combined / 27 city / 32 highway mpg |
| CO₂ Emissions | 191 g/km |
| EPA Greenhouse Gas Score | 6 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $2,850 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2018 Infiniti Q50 Hybrid, all with the 3.5L 6-cyl engine. Combined fuel economy ranges from 28 to 29 mpg (US), or 34 to 35 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 |
|---|---|---|---|---|---|---|
| 3.5L 6-cyl (Hybrid) | Automatic (S7) | All-Wheel Drive | 34 | 28 (26/30) | 199 | $2,950 |
| 3.5L 6-cyl (Hybrid) | Automatic (S7) | Rear-Wheel Drive | 35 | 29 (27/32) | 191 | $2,850 |
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 9 cubic feet (about 255 litres). These are US EPA interior-volume figures; they are measured differently from the boot capacity numbers UK manufacturers quote.
Owner Essentials for the 2018 Infiniti Q50 Hybrid
Running Costs: 2018 Infiniti Q50 Hybrid
Covering around 8,000 miles a year in a 2018 Infiniti Q50 Hybrid at 35 mpg combined, expect roughly 1,039 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $2,850 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.
2018 Infiniti Q50 Hybrid Safety Ratings (NHTSA)
No NHTSA crash-test rating is on record for this model year. The NHTSA rates only a subset of vehicles each year; you can browse every rated vehicle on our NHTSA Safety Ratings hub.
Recalls & Owner Complaints (NHTSA)
NHTSA lists 3 safety recall campaigns that include the 2018 Infiniti Q50 Hybrid (as of 6 October 2026). Most affected areas: Power train (1), Back over prevention (1), 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.
- Back over prevention — campaign 19V654000, reported 12 September 2019. Risk: The lack of an image in the back-up camera display increases the risk of a crash.
- Fuel system — campaign 17V476000, reported 27 July 2017. Risk: An engine stall can increase the risk of a crash.
Owners have filed 43 complaints with NHTSA about the 2018 Infiniti Q50 Hybrid. The most-reported areas are Engine (17), Air bags (9), Fuel/propulsion system (6). Complaints include 1 reported crash, 1 reported fire. That is close to the median of 62 complaints across the 5 Infiniti Q50 Hybrid model years in our data.
Used-buyer checklist for the 2018 Infiniti Q50 Hybrid
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Engine (17 owner complaints) — Listen for unusual noise on a cold start, check for warning lights and ask for the service records.
- Fuel system (1 recall campaign · 6 owner complaints) — Ask whether any fuel-pump or fuel-system recalls were completed, and watch for hard starting or stalling.
- Air bags (9 owner complaints) — Confirm any air bag inflator or module recalls were completed — enter the VIN at nhtsa.gov/recalls.
- Transmission & drivetrain (1 recall campaign) — 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
Infiniti models in our database average about 26 mpg (UK) combined on their most efficient configuration; the 2018 Infiniti Q50 Hybrid's 35 mpg is 9 mpg above that make average. Its 191 g/km CO₂ figure is 72 g/km lower than the 263 g/km Infiniti average.
Of the 5 Infiniti Q50 Hybrid model years we cover, the 2018 ranks 4th for combined fuel economy on its best configuration (35 mpg UK combined, against a high of 37 mpg). See every Infiniti Q50 Hybrid 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 2018 Infiniti Q50 Hybrid
Frequently Asked Questions
What engine does the 2018 Infiniti Q50 Hybrid have?
It's fitted with a 3.5L 6-cyl premium gasoline engine, paired with a automatic (s7) transmission.
What is the fuel economy of the 2018 Infiniti Q50 Hybrid?
The most efficient configuration returns around 35 mpg (UK) combined, or 29 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 34 to 35 mpg.
How much does the 2018 Infiniti Q50 Hybrid cost to fuel per year?
The US EPA estimates about $2,850 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 2018 Infiniti Q50 Hybrid have any recalls?
NHTSA lists 3 safety recall campaigns that include the 2018 Infiniti Q50 Hybrid (as of 6 October 2026). Most affected areas: Power train (1), Back over prevention (1), 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 2018 Infiniti Q50 Hybrid?
Among the 43 owner complaints filed with NHTSA, the most-reported areas are Engine (17 complaints), Air bags (9 complaints), Fuel/propulsion system (6 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 2018 Infiniti Q50 Hybrid have?
EPA measures interior passenger volume at 100 cubic feet (about 2,832 litres) and luggage volume at 9 cubic feet (about 255 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.