AutoSpecData

Acura RLX Fuel Economy (MPG)

What is the real-world gas mileage of a 2020 Acura RLX?

The 2020 Acura RLX gets up to 30 MPG combined (28 city / 31 highway) in EPA testing.

Latest model year (2020):

The Acura RLX gets up to 28 MPG combined (28 city / 29 highway) in the Auto (AM-S7), 6 cyl, 3.5 L trim.

Verifiedfueleconomy.gov · Verified August 9, 2026
OverviewMPGEngine SpecsFuel CostTransmissionDrivetrainVehicle ClassMaintenanceDimensionsCurb Weight

Acura RLX MPG — All Years

YearTrimEngineFuelCity (MPG)Hwy (MPG)Combined (MPG)
2020Config 1 of 2Auto (AM-S7), 6 cyl, 3.5 L6 3.5LPremium Gasoline282928
2020Config 2 of 2Auto (S10), 6 cyl, 3.5 L6 3.5LPremium Gasoline202923
2019Config 1 of 2Auto (AM-S7), 6 cyl, 3.5 L6 3.5LPremium Gasoline282928
2019Config 2 of 2Auto (S10), 6 cyl, 3.5 L6 3.5LPremium Gasoline202923
2018Config 1 of 2Auto (AM-S7), 6 cyl, 3.5 L6 3.5LPremium Gasoline282928
2018Config 2 of 2Auto (S10), 6 cyl, 3.5 L6 3.5LPremium Gasoline202923
2017Config 1 of 2Auto (AM-S7), 6 cyl, 3.5 L6 3.5LPremium Gasoline293029
2017Config 2 of 2Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline203023
2016Config 1 of 2Auto (AM7), 6 cyl, 3.5 L6 3.5LPremium Gasoline283130
2016Config 2 of 2Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline203023
2015Auto (S6), 6 cyl, 3.5 L6 3.5LPremium Gasoline203023

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.

Acura RLX data analysis

How Acura RLX combined fuel economy varies

Across 11 configurations recorded for the 2015 through 2020 Acura RLX, combined fuel economy runs from 23 MPG to 30 MPG. The strongest figure belongs to the 2016 Acura RLX (Auto (AM7), 6 cyl, 3.5 L) at 30 MPG, and the weakest to the 2020 car (Auto (S10), 6 cyl, 3.5 L) at 23 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 Acura RLX would be misleading.

What changed for 2020

Average combined fuel economy for the 2020 Acura RLX is 25.5 MPG, against 25.5 MPG for the 2019 car — it held flat. A carry-over year like this usually means no powertrain or structural change, so an older example is the cheaper way into the same specification.

How to read this Acura RLX data

This page lists every 2015 through 2020 Acura RLX record we hold for this measurement — 11 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 Acura RLX numbers

The 2015 through 2020 Acura RLX entries here cover the variants Auto (AM-S7), 6 cyl, 3.5 L, Auto (S10), 6 cyl, 3.5 L, Auto (S6), 6 cyl, 3.5 L and Auto (AM7), 6 cyl, 3.5 L. 2020 is the busiest model year in the record with 2 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 Acura RLX 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 Acura RLX 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 mph31 MPG31 MPG0%
65 mph31 MPG28.9 MPG7%
70 mph31 MPG26.9 MPG13%
75 mph31 MPG25.1 MPG19%
80 mph31 MPG23.4 MPG25%

Our Real-World Speed MPG Adjuster re-scales the Acura RLX 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 RLX MPG

What is the MPG of the Acura RLX?

The Acura RLX gets up to 30 MPG combined (28 city / 31 highway) in the 2020 model year. Fuel economy varies by engine and trim — see the full table above for details.

Which Acura RLX trim has the best fuel economy?

The Auto (AM7), 6 cyl, 3.5 L trim offers the best combined fuel economy at 30 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.

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