2018 Genesis G80 — Full Specifications
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The 2018 Genesis G80 is a saloon/sedan offered with 3 engines (3.3L 6-cyl turbo, 3.8L 6-cyl, 5L 8-cyl). Its most fuel-efficient configuration returns around 26 mpg (UK) / 22 mpg (US EPA) combined, with 22–26 mpg (UK) across all configurations. Owners often keep a Genesis G80 workshop manual to hand for servicing and repairs.
Compared with the 2017 Genesis G80: Fuel economy is essentially unchanged at around 26 mpg (UK) combined. EPA lists new engine options for 2018: 3.3L 6-cyl turbo. It carries the same 5★ overall NHTSA rating.
Full Specifications
| Engine (most efficient) | 3.8L 6-cyl |
|---|---|
| Engine options | 3.3L 6-cyl turbo · 3.8L 6-cyl · 5L 8-cyl |
| Transmission (most efficient) | Automatic (S8) |
| Fuel Type | Regular Gasoline |
| Powertrain | Conventional |
| Drive | Rear-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 108 cu ft (3,058 L) |
| Luggage Volume (EPA) | 15 cu ft (425 L) |
| Fuel Economy (UK) | 26 combined / 23 urban / 32 extra-urban mpg |
| Fuel Economy (US EPA) | 22 combined / 19 city / 27 highway mpg |
| CO₂ Emissions | 257 g/km |
| EPA Greenhouse Gas Score | 4 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $3,050 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 6 configurations for the 2018 Genesis G80 across 3 engines (3.3L 6-cyl turbo, 3.8L 6-cyl, 5L 8-cyl). Combined fuel economy ranges from 18 to 22 mpg (US), or 22 to 26 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) | 281 | $4,100 |
| 3.3L 6-cyl turbo | Automatic (S8) | Rear-Wheel Drive | 24 | 20 (17/25) | 275 | $4,100 |
| 3.8L 6-cyl | Automatic (S8) | All-Wheel Drive | 24 | 20 (18/25) | 277 | $3,350 |
| 3.8L 6-cyl | Automatic (S8) | Rear-Wheel Drive | 26 | 22 (19/27) | 257 | $3,050 |
| 5L 8-cyl | Automatic (S8) | All-Wheel Drive | 22 | 18 (15/23) | 313 | $4,550 |
| 5L 8-cyl | Automatic (S8) | Rear-Wheel Drive | 23 | 19 (16/24) | 295 | $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 108 cubic feet (about 3,058 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 2018 Genesis G80
Running Costs: 2018 Genesis G80
Covering around 8,000 miles a year in a 2018 Genesis G80 at 26 mpg combined, expect roughly 1,399 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $3,050 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 Genesis G80 Safety Ratings (NHTSA)
Recalls & Owner Complaints (NHTSA)
NHTSA lists 6 safety recall campaigns that include the 2018 Genesis G80 (as of 6 October 2026). Most affected areas: Engine and engine cooling (2), Electrical system (1), Service brakes (1). 2 campaigns carried a “do not drive” or “park outside” advisory. 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.
- Electrical system — campaign 24V107000, reported 13 February 2024. Risk: An engine compartment fire while parked or driving can increase the risk of injury.
- Service brakes — campaign 21V160000, reported 10 March 2021. Risk: An electrical short circuit inside the ABS module could cause an engine compartment fire while parked or driving.
- Engine and engine cooling — campaign 19V538000, reported 19 July 2019. Risk: Oil leaking onto the exhaust manifold increases the risk of a fire.
Showing the 4 most recent of 6 campaigns.
Owners have filed 95 complaints with NHTSA about the 2018 Genesis G80. The most-reported areas are Electrical system (22), Unspecified (17), Steering (15). Complaints include 8 reported crashes, 5 reported injuries.
Used-buyer checklist for the 2018 Genesis G80
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Electrical system (1 recall campaign · 22 owner complaints) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
- Engine cooling (2 recall campaigns) — Check coolant level, look for leaks and make sure the temperature stays steady in traffic.
- Steering (15 owner complaints) — Check for play, noise or heavy steering, and ask whether any steering recall work was done.
- Engine (11 owner complaints) — Listen for unusual noise on a cold start, check for warning lights and ask for the service records.
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
At 26 mpg (UK) combined it sits close to the 27 mpg average for Genesis models in our database.
Of the 10 Genesis G80 model years we cover, the 2018 ranks 7th for combined fuel economy on its best configuration (26 mpg UK combined, against a high of 31 mpg). 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 2018 Genesis G80
Frequently Asked Questions
What engine does the 2018 Genesis G80 have?
EPA lists 3 engines for the 2018 Genesis G80: 3.3L 6-cyl turbo, 3.8L 6-cyl, 5L 8-cyl. The most fuel-efficient configuration pairs the 3.8L 6-cyl with a automatic (s8).
What is the fuel economy of the 2018 Genesis G80?
The most efficient configuration returns around 26 mpg (UK) combined, or 22 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 22 to 26 mpg.
How much does the 2018 Genesis G80 cost to fuel per year?
The US EPA estimates about $3,050 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 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 2018 Genesis G80 have any recalls?
NHTSA lists 6 safety recall campaigns that include the 2018 Genesis G80 (as of 6 October 2026). Most affected areas: Engine and engine cooling (2), Electrical system (1), Service brakes (1). 2 campaigns carried a “do not drive” or “park outside” advisory. 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 Genesis G80?
Among the 95 owner complaints filed with NHTSA, the most-reported areas are Electrical system (22 complaints), Unspecified (17 complaints), Steering (15 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 Genesis G80 have?
EPA measures interior passenger volume at 108 cubic feet (about 3,058 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.