2020 Lexus GS 350 — Full Specifications
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The 2020 Lexus GS 350 is a saloon/sedan powered by a 3.5L 6-cyl premium gasoline engine. Its most fuel-efficient configuration returns around 28 mpg (UK) / 23 mpg (US EPA) combined, with 25–28 mpg (UK) across all configurations. Owners often keep a Lexus GS 350 workshop manual to hand for servicing and repairs.
Compared with the 2019 Lexus GS 350: Fuel economy is essentially unchanged at around 28 mpg (UK) combined. The engine line-up listed by EPA is unchanged.
Full Specifications
| Engine | 3.5L 6-cyl |
|---|---|
| Transmission | Automatic (S8) |
| Fuel Type | Premium Gasoline |
| Powertrain | Conventional |
| Drive | Rear-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 99 cu ft (2,803 L) |
| Luggage Volume (EPA) | 14 cu ft (396 L) |
| Fuel Economy (UK) | 28 combined / 24 urban / 34 extra-urban mpg |
| Fuel Economy (US EPA) | 23 combined / 20 city / 28 highway mpg |
| CO₂ Emissions | 241 g/km |
| EPA Greenhouse Gas Score | 5 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $3,550 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2020 Lexus GS 350, all with the 3.5L 6-cyl engine. Combined fuel economy ranges from 21 to 23 mpg (US), or 25 to 28 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 | Automatic (S6) | All-Wheel Drive | 25 | 21 (19/26) | 262 | $3,900 |
| 3.5L 6-cyl | Automatic (S8) | Rear-Wheel Drive | 28 | 23 (20/28) | 241 | $3,550 |
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 99 cubic feet (about 2,803 litres) and luggage volume at 14 cubic feet (about 396 litres). These are US EPA interior-volume figures; they are measured differently from the boot capacity numbers UK manufacturers quote.
Owner Essentials for the 2020 Lexus GS 350
Running Costs: 2020 Lexus GS 350
Covering around 8,000 miles a year in a 2020 Lexus GS 350 at 28 mpg combined, expect roughly 1,299 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $3,550 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.
2020 Lexus GS 350 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.
How It Compares
At 28 mpg (UK) combined it sits close to the 28 mpg average for Lexus models in our database. Its 241 g/km CO₂ figure is 11 g/km lower than the 252 g/km Lexus average.
Of the 10 Lexus GS 350 model years we cover, the 2020 is the most economical on its best configuration (28 mpg UK combined). See every Lexus GS 350 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 2020 Lexus GS 350
Frequently Asked Questions
What engine does the 2020 Lexus GS 350 have?
It's fitted with a 3.5L 6-cyl premium gasoline engine, paired with a automatic (s8) transmission.
What is the fuel economy of the 2020 Lexus GS 350?
The most efficient configuration returns around 28 mpg (UK) combined, or 23 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 25 to 28 mpg.
How much does the 2020 Lexus GS 350 cost to fuel per year?
The US EPA estimates about $3,550 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.
How much interior and luggage space does the 2020 Lexus GS 350 have?
EPA measures interior passenger volume at 99 cubic feet (about 2,803 litres) and luggage volume at 14 cubic feet (about 396 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.