2021 Infiniti QX80 — Full Specifications

Reviewed by the 247VehicleCheck Data Team — automotive data reviewers

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18Combined MPG (UK)

5.6L 8-cylEngine

Premium GasolineFuel Type

N/AInsurance Group UK

4★NHTSA Safety

368CO₂ g/km

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 2021 Infiniti QX80 is a suv powered by a 5.6L 8-cyl premium gasoline engine, returning around 18 mpg (UK) / 15.0 mpg (US EPA) combined. Owners often keep a Infiniti QX80 workshop manual to hand for servicing and repairs.

Full Specifications

Engine	5.6L 8-cyl
Transmission	Automatic (S7)
Fuel Type	Premium Gasoline
Powertrain	Conventional
Drive	4-Wheel Drive
Body Style	SUV
Seats	Data not available
Length	Data not available
Width	Data not available
Height	Data not available
Kerb Weight	Data not available
Fuel Economy (UK)	18 combined / 16 urban / 23 extra-urban mpg
Fuel Economy (US EPA)	15.0 combined / 13.0 city / 19.0 highway mpg
CO₂ Emissions	368 g/km

Owner Essentials for the Infiniti QX80

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UK Running Costs

Insurance group not available — check with your insurer. At around 8,000 miles per year and 18 mpg combined, expect roughly 2020 litres of fuel annually — multiply by your local price per litre for a cost estimate. Work out exact fuel costs with the fuel cost calculator on 247Calculators. Planning a road trip? turn this SUV into a basecamp with Traverseon's sleeping-platform kit .

Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.

Planning a road trip? Grab a road trip packing list. Only need this car occasionally? See our buy vs rent comparison.

Safety Ratings (NHTSA)

4★Overall

3★Frontal

5★Side

3★Rollover

How It Compares

How does the Infiniti QX80 compare to similar SUVs? For context, SUVs in our database average around 27 mpg (UK) combined — this model's 18 mpg figure is 9 mpg below that average. Its 368 g/km CO₂ figure is 107 g/km higher than the 261 g/km average for SUVs on this site. This comparison is based on 894 SUVs in our dataset.

Last updated: 12 September 2026 · Data: US EPA (fueleconomy.gov) & NHTSA snapshots 18 July 2026; Wikidata & curated EU catalogue 18 July 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.

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Frequently Asked Questions

What engine does the 2021 Infiniti QX80 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 2021 Infiniti QX80?

It returns around 18 mpg (UK) combined, or 15.0 mpg on the US EPA cycle.

Does the 2021 Infiniti QX80 have a good safety rating?

It holds an overall NHTSA rating of 4 stars, with 3 stars for frontal crash protection.

How many seats does the 2021 Infiniti QX80 have?

Seating capacity data is not available for this model year. It's classed as a suv.

Is the Infiniti QX80's fuel economy good for a SUV?

It returns around 18 mpg (UK) combined, against a same-body-style average of roughly 27 mpg among the SUVs we track.