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Lexus IS Fuel Economy (MPG)

What is the real-world gas mileage of a 2026 Lexus IS?

The 2026 Lexus IS gets up to 26 MPG combined (22 city / 32 highway) in EPA testing.

Latest model year (2026):

The Lexus IS gets up to 22 MPG combined (19 city / 26 highway) in the Auto (S6), 6 cyl, 3.5 L trim.

Verifiedfueleconomy.gov · Verified August 11, 2026
OverviewMPGEngine SpecsFuel CostTransmissionDrivetrainVehicle ClassMaintenanceDimensionsCurb Weight

Lexus IS MPG — All Years

YearTrimEngineFuelCity (MPG)Hwy (MPG)Combined (MPG)
2026Config 1 of 2Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192622
2026Config 2 of 2Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline192722
2025Config 1 of 4Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192622
2025Config 2 of 4Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline213125
2025Config 3 of 4Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline202823
2025Config 4 of 4Auto (S8), 8 cyl, 5.0 L8 5.0LPremium Gasoline172520
2024Config 1 of 4Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192622
2024Config 2 of 4Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline213125
2024Config 3 of 4Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline202823
2024Config 4 of 4Auto (S8), 8 cyl, 5.0 L8 5.0LPremium Gasoline172520
2023Config 1 of 4Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192622
2023Config 2 of 4Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline213125
2023Config 3 of 4Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline202823
2023Config 4 of 4Auto (S8), 8 cyl, 5.0 L8 5.0LPremium Gasoline172520
2022Config 1 of 4Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192622
2022Config 2 of 4Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline213125
2022Config 3 of 4Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline202823
2022Config 4 of 4Auto (S8), 8 cyl, 5.0 L8 5.0LPremium Gasoline172520
2021Config 1 of 3Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192622
2021Config 2 of 3Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline213125
2021Config 3 of 3Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline202823
2020Config 1 of 4Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline182421
2020Config 2 of 4Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192621
2020Config 3 of 4Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline213024
2020Config 4 of 4Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline202823
2019Config 1 of 3Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192621
2019Config 2 of 3Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline213024
2019Config 3 of 3Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline202823
2018Config 1 of 3Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192622
2018Config 2 of 3Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline223226
2018Config 3 of 3Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline202823
2017Config 1 of 3Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192621
2017Config 2 of 3Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline223226
2017Config 3 of 3Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline192822
2016Config 1 of 3Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192621
2016Config 2 of 3Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline223226
2016Config 3 of 3Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline192822
2015Config 1 of 6Auto (S6), 6 cyl, 2.5 L6 2.5LPremium Gasoline202723
2015Config 2 of 6Auto (S6), 6 cyl, 2.5 L6 2.5LPremium Gasoline213024
2015Config 3 of 6Auto (S6), 6 cyl, 2.5 L6 2.5LPremium Gasoline213024
2015Config 4 of 6Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192621
2015Config 5 of 6Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline192722
2015Config 6 of 6Auto (S8), 6 cyl, 3.5 L6 3.5LPremium Gasoline192822

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 IS data analysis

How Lexus IS combined fuel economy varies

Across 43 configurations recorded for the 2015 through 2026 Lexus IS, combined fuel economy runs from 20 MPG to 26 MPG. The strongest figure belongs to the 2016 Lexus IS (Auto (S8), 4 cyl, 2.0 L) at 26 MPG, and the weakest to the 2025 car (Auto (S8), 8 cyl, 5.0 L) at 20 MPG — a spread of 30%. 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 IS would be misleading.

What changed for 2026

Average combined fuel economy for the 2026 Lexus IS is 22 MPG, against 22.5 MPG for the 2025 car — it fell by 0.5 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 IS data

This page lists every 2015 through 2026 Lexus IS record we hold for this measurement — 43 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 IS numbers

The 2015 through 2026 Lexus IS entries here cover the variants Auto (S6), 6 cyl, 3.5 L, Auto (S8), 6 cyl, 3.5 L, Auto (S8), 4 cyl, 2.0 L, Auto (S8), 8 cyl, 5.0 L and Auto (S6), 6 cyl, 2.5 L. 2015 is the busiest model year in the record with 6 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 IS 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 IS 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 speedEPA highway specAutoSpecData adjusted MPGFuel you lose
60 mph32 MPG32 MPG0%
65 mph32 MPG29.8 MPG7%
70 mph32 MPG27.8 MPG13%
75 mph32 MPG25.9 MPG19%
80 mph32 MPG24.1 MPG25%

Our Real-World Speed MPG Adjuster re-scales the Lexus IS 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 IS MPG

What is the MPG of the Lexus IS?

The Lexus IS gets up to 26 MPG combined (22 city / 32 highway) in the 2026 model year. Fuel economy varies by engine and trim — see the full table above for details.

Which Lexus IS trim has the best fuel economy?

The Auto (S8), 4 cyl, 2.0 L trim offers the best combined fuel economy at 26 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.

View full Lexus IS specs

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