2021 Genesis G90 — Full Specifications
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The 2021 Genesis G90 is a saloon/sedan offered with 2 engines (3.3L 6-cyl turbo, 5L 8-cyl). Its most fuel-efficient configuration returns around 24 mpg (UK) / 20 mpg (US EPA) combined, with 22–24 mpg (UK) across all configurations. Owners often keep a Genesis G90 workshop manual to hand for servicing and repairs.
Compared with the 2020 Genesis G90: Fuel economy is essentially unchanged at around 24 mpg (UK) combined. The engine line-up listed by EPA is unchanged.
Full Specifications
| Engine (most efficient) | 3.3L 6-cyl turbo |
|---|---|
| Engine options | 3.3L 6-cyl turbo · 5L 8-cyl |
| Transmission (most efficient) | Automatic (S8) |
| Fuel Type | Premium Gasoline |
| Powertrain | Conventional |
| Drive | All-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 113 cu ft (3,200 L) |
| Luggage Volume (EPA) | 15 cu ft (425 L) |
| Fuel Economy (UK) | 24 combined / 20 urban / 29 extra-urban mpg |
| Fuel Economy (US EPA) | 20 combined / 17 city / 24 highway mpg |
| CO₂ Emissions | 286 g/km |
| EPA Greenhouse Gas Score | 3 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $4,100 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 4 configurations for the 2021 Genesis G90 across 2 engines (3.3L 6-cyl turbo, 5L 8-cyl). Combined fuel economy ranges from 18 to 20 mpg (US), or 22 to 24 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 |
|---|---|---|---|---|---|---|
| 3.3L 6-cyl turbo | Automatic (S8) | All-Wheel Drive | 24 | 20 (17/24) | 286 | $4,100 |
| 3.3L 6-cyl turbo | Automatic (S8) | Rear-Wheel Drive | 23 | 19 (17/24) | 285 | $4,350 |
| 5L 8-cyl | Automatic (S8) | All-Wheel Drive | 22 | 18 (16/23) | 303 | $4,550 |
| 5L 8-cyl | Automatic (S8) | Rear-Wheel Drive | 23 | 19 (16/24) | 299 | $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 113 cubic feet (about 3,200 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 G90
Running Costs: 2021 Genesis G90
Covering around 8,000 miles a year in a 2021 Genesis G90 at 24 mpg combined, expect roughly 1,515 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $4,100 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 G90 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 1 safety recall campaign that include the 2021 Genesis G90 (as of 6 October 2026). Most affected areas: Engine and engine cooling (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
- Engine and engine cooling — campaign 24V191000, reported 8 March 2024. Risk: An oil leak in the presence of hot engine components can increase the risk of an engine compartment fire.
Owners have filed 5 complaints with NHTSA about the 2021 Genesis G90. The most-reported areas are Unspecified (2), Forward collision avoidance (2), Electrical system (1). Complaints include 1 reported crash.
Used-buyer checklist for the 2021 Genesis G90
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Engine cooling (1 recall campaign) — Check coolant level, look for leaks and make sure the temperature stays steady in traffic.
- Driver-assist sensors (2 owner complaints) — Check that driver-assist warning lights are off and sensors are clean and undamaged.
- Electrical system (1 owner complaint) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
- Steering (1 owner complaint) — Check for play, noise or heavy steering, and ask whether any steering recall work was done.
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 G90's 24 mpg is 3 mpg below that make average. Its 286 g/km CO₂ figure is 37 g/km higher than the 249 g/km Genesis average.
Of the 10 Genesis G90 model years we cover, the 2021 ranks 5th for combined fuel economy on its best configuration (24 mpg UK combined, against a high of 25 mpg). See every Genesis G90 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 G90
Frequently Asked Questions
What engine does the 2021 Genesis G90 have?
EPA lists 2 engines for the 2021 Genesis G90: 3.3L 6-cyl turbo, 5L 8-cyl. The most fuel-efficient configuration pairs the 3.3L 6-cyl turbo with a automatic (s8).
What is the fuel economy of the 2021 Genesis G90?
The most efficient configuration returns around 24 mpg (UK) combined, or 20 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 22 to 24 mpg.
How much does the 2021 Genesis G90 cost to fuel per year?
The US EPA estimates about $4,100 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 G90 have any recalls?
NHTSA lists 1 safety recall campaign that include the 2021 Genesis G90 (as of 6 October 2026). Most affected areas: Engine and engine cooling (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 G90?
Among the 5 owner complaints filed with NHTSA, the most-reported areas are Unspecified (2 complaints), Forward collision avoidance (2 complaints), Electrical 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 2021 Genesis G90 have?
EPA measures interior passenger volume at 113 cubic feet (about 3,200 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.