Lexus GS Fuel Economy (MPG)
What is the real-world gas mileage of a 2020 Lexus GS?
The 2020 Lexus GS gets up to 31 MPG combined (29 city / 34 highway) in EPA testing.
Latest model year (2020):
The Lexus GS gets up to 23 MPG combined (20 city / 28 highway) in the Auto (S8), 6 cyl, 3.5 L trim.
Lexus GS MPG — All Years
| Year | Trim | Engine | Fuel | City (MPG) | Hwy (MPG) | Combined (MPG) |
|---|---|---|---|---|---|---|
| 2020Config 1 of 4 | Auto (S6), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 26 | 21 |
| 2020Config 2 of 4 | Auto (S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 20 | 28 | 23 |
| 2020Config 3 of 4 | Auto (S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 27 | 22 |
| 2020Config 4 of 4 | Auto (S8), 8 cyl, 5.0 L | 8 5.0L | Premium Gasoline | 16 | 24 | 19 |
| 2019Config 1 of 6 | Auto (S6), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 26 | 21 |
| 2019Config 2 of 6 | Auto (S8), 4 cyl, 2.0 L | 4 2.0L | Premium Gasoline | 21 | 30 | 24 |
| 2019Config 3 of 6 | Auto (S8), 4 cyl, 2.0 L | 4 2.0L | Premium Gasoline | 22 | 32 | 26 |
| 2019Config 4 of 6 | Auto (S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 27 | 22 |
| 2019Config 5 of 6 | Auto (S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 20 | 28 | 23 |
| 2019Config 6 of 6 | Auto (S8), 8 cyl, 5.0 L | 8 5.0L | Premium Gasoline | 16 | 24 | 19 |
| 2018Config 1 of 7 | Auto (AV-S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 29 | 34 | 31 |
| 2018Config 2 of 7 | Auto (S6), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 26 | 22 |
| 2018Config 3 of 7 | Auto (S8), 4 cyl, 2.0 L | 4 2.0L | Premium Gasoline | 21 | 30 | 24 |
| 2018Config 4 of 7 | Auto (S8), 4 cyl, 2.0 L | 4 2.0L | Premium Gasoline | 22 | 32 | 26 |
| 2018Config 5 of 7 | Auto (S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 20 | 28 | 23 |
| 2018Config 6 of 7 | Auto (S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 27 | 22 |
| 2018Config 7 of 7 | Auto (S8), 8 cyl, 5.0 L | 8 5.0L | Premium Gasoline | 16 | 24 | 19 |
| 2017Config 1 of 7 | Auto (AV-S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 29 | 34 | 31 |
| 2017Config 2 of 7 | Auto (S6), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 26 | 22 |
| 2017Config 3 of 7 | Auto (S8), 4 cyl, 2.0 L | 4 2.0L | Premium Gasoline | 22 | 32 | 26 |
| 2017Config 4 of 7 | Auto (S8), 4 cyl, 2.0 L | 4 2.0L | Premium Gasoline | 21 | 30 | 24 |
| 2017Config 5 of 7 | Auto (S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 20 | 28 | 23 |
| 2017Config 6 of 7 | Auto (S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 27 | 22 |
| 2017Config 7 of 7 | Auto (S8), 8 cyl, 5.0 L | 8 5.0L | Premium Gasoline | 16 | 24 | 19 |
| 2016Config 1 of 7 | Auto (AV-S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 29 | 34 | 31 |
| 2016Config 2 of 7 | Auto (S6), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 26 | 22 |
| 2016Config 3 of 7 | Auto (S8), 4 cyl, 2.0 L | 4 2.0L | Premium Gasoline | 22 | 32 | 26 |
| 2016Config 4 of 7 | Auto (S8), 4 cyl, 2.0 L | 4 2.0L | Premium Gasoline | 21 | 30 | 24 |
| 2016Config 5 of 7 | Auto (S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 27 | 22 |
| 2016Config 6 of 7 | Auto (S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 20 | 28 | 23 |
| 2016Config 7 of 7 | Auto (S8), 8 cyl, 5.0 L | 8 5.0L | Premium Gasoline | 16 | 24 | 19 |
| 2015Config 1 of 3 | Auto (AV-S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 29 | 34 | 31 |
| 2015Config 2 of 3 | Auto (S6), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 26 | 21 |
| 2015Config 3 of 3 | Auto (S8), 6 cyl, 3.5 L | 6 3.5L | Premium Gasoline | 19 | 29 | 23 |
Data sourced from fueleconomy.gov (U.S. Department of Energy). MPG figures are EPA-tested. Fuel costs are estimates based on average fuel prices and 15,000 miles/year.
Lexus GS data analysis
How Lexus GS combined fuel economy varies
Across 34 configurations recorded for the 2015 through 2020 Lexus GS, combined fuel economy runs from 19 MPG to 31 MPG. The strongest figure belongs to the 2015 Lexus GS (Auto (AV-S8), 6 cyl, 3.5 L) at 31 MPG, and the weakest to the 2020 car (Auto (S8), 8 cyl, 5.0 L) at 19 MPG — a spread of 63%. A gap that wide means the model year and configuration you buy matter more than the nameplate does: quoting a single number for the Lexus GS would be misleading.
What changed for 2020
Average combined fuel economy for the 2020 Lexus GS is 21.3 MPG, against 22.5 MPG for the 2019 car — it fell by 1.3 MPG. Buyers who care most about this figure should look at the earlier model years in the table above before assuming newest is best.
How to read this Lexus GS data
This page lists every 2015 through 2020 Lexus GS record we hold for this measurement — 34 rows in total, one per configuration and model year rather than a single headline figure. Figures are published as the source agency records them: we do not round, average or interpolate missing years, and a year that is absent from the table is a year with no published measurement rather than a zero. Where a manufacturer offered several drivetrains or body styles in the same year, each appears on its own row, because those variants rarely share the same numbers.
Configurations behind these Lexus GS numbers
The 2015 through 2020 Lexus GS entries here cover the variants Auto (S6), 6 cyl, 3.5 L, Auto (S8), 6 cyl, 3.5 L, Auto (S8), 8 cyl, 5.0 L, Auto (S8), 4 cyl, 2.0 L and Auto (AV-S8), 6 cyl, 3.5 L. 2018 is the busiest model year in the record with 7 separate measured configurations, which is why a single quoted combined fuel economy figure for that year is rarely the one that matches the car in front of you. Match the row to the exact drivetrain, body style and engine on the window sticker or VIN before relying on the number, and use the comparison links below to see how those same configurations line up against rival models.
Where these Lexus GS figures come from
Every value on this page is loaded from federal open data — EPA fuel economy submissions, NHTSA vehicle and crash-test records, and manufacturer specification filings — rather than dealer listings or copied editorial content. The Lexus GS record refreshes as the agencies publish, which typically means new model-year rows appear in the autumn and crash-test results follow through the model year as vehicles are tested. Because certification data is filed per configuration, treat any single headline number for this vehicle with caution: the figure that applies to a specific car depends on its engine, drivetrain, body style and model year, all of which are listed separately above. If a number here disagrees with a brochure, the brochure is usually quoting the best available configuration rather than the one being sold.
Official Factory Specs vs. AutoSpecData Expert Benchmarks
The EPA highway loop never holds interstate speed. Here is what the same engine does when you sit on the cruise control.
| Cruise speed | EPA highway spec | AutoSpecData adjusted MPG | Fuel you lose |
|---|---|---|---|
| 60 mph | 34 MPG | 34 MPG | 0% |
| 65 mph | 34 MPG | 31.7 MPG | 7% |
| 70 mph | 34 MPG | 29.5 MPG | 13% |
| 75 mph | 34 MPG | 27.5 MPG | 19% |
| 80 mph | 34 MPG | 25.6 MPG | 25% |
Our Real-World Speed MPG Adjuster re-scales the Lexus GS EPA highway result with a quadratic drag term (mpg = hwy ÷ (1 + k·(v² − 60²)/60²), k = 0.55 for trucks, SUVs and vans, 0.42 for cars). Wind, roof racks, and a heavy right foot make it worse, never better.
Frequently Asked Questions About GS MPG
What is the MPG of the Lexus GS?
The Lexus GS gets up to 31 MPG combined (29 city / 34 highway) in the 2020 model year. Fuel economy varies by engine and trim — see the full table above for details.
Which Lexus GS trim has the best fuel economy?
The Auto (AV-S8), 6 cyl, 3.5 L trim offers the best combined fuel economy at 31 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.