2021 Genesis G80 — Full Specifications
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The 2021 Genesis G80 is a saloon/sedan offered with 2 engines (2.5L 4-cyl turbo, 3.5L 6-cyl turbo). Its most fuel-efficient configuration returns around 31 mpg (UK) / 26 mpg (US EPA) combined, with 25–31 mpg (UK) across all configurations. Owners often keep a Genesis G80 workshop manual to hand for servicing and repairs.
Compared with the 2020 Genesis G80: Fuel economy improves from 25 to 31 mpg (UK) combined on the most efficient configuration. EPA lists new engine options for 2021: 2.5L 4-cyl turbo, 3.5L 6-cyl turbo. No longer listed: 3.3L 6-cyl turbo, 3.8L 6-cyl, 5L 8-cyl. It carries the same 5★ overall NHTSA rating. EPA passenger volume changes from 108 to 107 cu ft.
Full Specifications
| Engine (most efficient) | 2.5L 4-cyl turbo |
|---|---|
| Engine options | 2.5L 4-cyl turbo · 3.5L 6-cyl turbo |
| Transmission (most efficient) | Automatic (S8) |
| Fuel Type | Premium Gasoline |
| Powertrain | Conventional |
| Drive | Rear-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 107 cu ft (3,030 L) |
| Luggage Volume (EPA) | 15 cu ft (425 L) |
| Fuel Economy (UK) | 31 combined / 28 urban / 38 extra-urban mpg |
| Fuel Economy (US EPA) | 26 combined / 23 city / 32 highway mpg |
| CO₂ Emissions | 214 g/km |
| EPA Greenhouse Gas Score | 5 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $3,150 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 4 configurations for the 2021 Genesis G80 across 2 engines (2.5L 4-cyl turbo, 3.5L 6-cyl turbo). Combined fuel economy ranges from 21 to 26 mpg (US), or 25 to 31 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 turbo | Automatic (S8) | All-Wheel Drive | 30 | 25 (22/30) | 224 | $3,300 |
| 2.5L 4-cyl turbo | Automatic (S8) | Rear-Wheel Drive | 31 | 26 (23/32) | 214 | $3,150 |
| 3.5L 6-cyl turbo | Automatic (S8) | All-Wheel Drive | 25 | 21 (18/26) | 262 | $3,900 |
| 3.5L 6-cyl turbo | Automatic (S8) | Rear-Wheel Drive | 26 | 22 (19/27) | 255 | $3,750 |
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 107 cubic feet (about 3,030 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 2021 Genesis G80
Running Costs: 2021 Genesis G80
Covering around 8,000 miles a year in a 2021 Genesis G80 at 31 mpg combined, expect roughly 1,173 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $3,150 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.
2021 Genesis G80 Safety Ratings (NHTSA)
Recalls & Owner Complaints (NHTSA)
NHTSA lists 4 safety recall campaigns that include the 2021 Genesis G80 (as of 6 October 2026). Most affected areas: Fuel system (3), Seat belts (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
- Fuel system — campaign 26V229000, reported 10 April 2026. Risk: A fuel leak increases the risk of a fire.
- Fuel system — campaign 23V630000, reported 11 September 2023. Risk: A loss of drive power can increase the risk of a crash.
- Seat belts — campaign 23V094000, reported 16 February 2023. Risk: An exploding seat belt pretensioner can project metal fragments into the vehicle, strike vehicle occupants, and result in injury.
- Fuel system — campaign 21V208000, reported 24 March 2021. Risk: A fuel leak in the presence of an ignition source can increase the risk of a fire.
Owners have filed 9 complaints with NHTSA about the 2021 Genesis G80. The most-reported areas are Service brakes (3), Tires (3), Electrical system (2).
Used-buyer checklist for the 2021 Genesis G80
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Fuel system (3 recall campaigns) — Ask whether any fuel-pump or fuel-system recalls were completed, and watch for hard starting or stalling.
- Seat belts (1 recall campaign) — Check every belt latches and retracts properly and that any restraint recalls were completed.
- Brakes (3 owner complaints) — Brake firmly from speed and look for pulling, vibration or a soft pedal; ask for brake service history.
- Tyres (3 owner complaints) — Check tyre age and wear and ask about any tyre recalls.
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
Genesis models in our database average about 27 mpg (UK) combined on their most efficient configuration; the 2021 Genesis G80's 31 mpg is 4 mpg above that make average. Its 214 g/km CO₂ figure is 35 g/km lower than the 249 g/km Genesis average.
Of the 10 Genesis G80 model years we cover, the 2021 is the most economical on its best configuration (31 mpg UK combined). See every Genesis G80 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 2021 Genesis G80
Frequently Asked Questions
What engine does the 2021 Genesis G80 have?
EPA lists 2 engines for the 2021 Genesis G80: 2.5L 4-cyl turbo, 3.5L 6-cyl turbo. The most fuel-efficient configuration pairs the 2.5L 4-cyl turbo with a automatic (s8).
What is the fuel economy of the 2021 Genesis G80?
The most efficient configuration returns around 31 mpg (UK) combined, or 26 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 25 to 31 mpg.
How much does the 2021 Genesis G80 cost to fuel per year?
The US EPA estimates about $3,150 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 2021 Genesis G80 have a good safety rating?
It holds an overall NHTSA rating of 5 stars, with 5 stars for frontal crash protection.
Does the 2021 Genesis G80 have any recalls?
NHTSA lists 4 safety recall campaigns that include the 2021 Genesis G80 (as of 6 October 2026). Most affected areas: Fuel system (3), Seat belts (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 2021 Genesis G80?
Among the 9 owner complaints filed with NHTSA, the most-reported areas are Service brakes (3 complaints), Tires (3 complaints), Electrical system (2 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 2021 Genesis G80 have?
EPA measures interior passenger volume at 107 cubic feet (about 3,030 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.