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Buick Regal Fuel Economy (MPG)

What is the real-world gas mileage of a 2020 Buick Regal?

The 2020 Buick Regal gets up to 28 MPG combined (24 city / 35 highway) in EPA testing.

Latest model year (2020):

The Buick Regal gets up to 26 MPG combined (22 city / 32 highway) in the Auto (S9), 4 cyl, 2.0 L trim.

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

Buick Regal MPG — All Years

YearTrimEngineFuelCity (MPG)Hwy (MPG)Combined (MPG)
2020Config 1 of 4Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline212924
2020Config 2 of 4Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline212924
2020Config 3 of 4Auto (S9), 4 cyl, 2.0 L4 2.0LPremium Gasoline223226
2020Config 4 of 4Auto (S9), 6 cyl, 3.6 L6 3.6LRegular Gasoline192722
2019Config 1 of 4Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline212924
2019Config 2 of 4Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline212924
2019Config 3 of 4Auto (S9), 4 cyl, 2.0 L4 2.0LPremium Gasoline223226
2019Config 4 of 4Auto (S9), 6 cyl, 3.6 L6 3.6LRegular Gasoline192722
2018Config 1 of 4Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline212924
2018Config 2 of 4Auto (S8), 4 cyl, 2.0 L4 2.0LPremium Gasoline212924
2018Config 3 of 4Auto (S9), 4 cyl, 2.0 L4 2.0LPremium Gasoline223226
2018Config 4 of 4Auto (S9), 6 cyl, 3.6 L6 3.6LRegular Gasoline192722
2017Config 1 of 3Auto (S6), 4 cyl, 2.0 L4 2.0LPremium Gasoline212924
2017Config 2 of 3Auto (S6), 4 cyl, 2.0 L4 2.0LPremium Gasoline192722
2017Config 3 of 3Auto (S6), 4 cyl, 2.4 L4 2.4LRegular Gasoline193023
2016Config 1 of 5Auto (S6), 4 cyl, 2.0 L4 2.0LRegular Gasoline192722
2016Config 2 of 5Auto (S6), 4 cyl, 2.0 L4 2.0LRegular Gasoline212924
2016Config 3 of 5Auto (S6), 4 cyl, 2.4 L4 2.4LRegular Gasoline193023
2016Config 4 of 5Auto (S6), 4 cyl, 2.4 L4 2.4LRegular Gasoline243528
2016Config 5 of 5Man 6-spd, 4 cyl, 2.0 L4 2.0LRegular Gasoline203024
2015Config 1 of 5Auto (S6), 4 cyl, 2.0 L4 2.0LRegular Gasoline192722
2015Config 2 of 5Auto (S6), 4 cyl, 2.0 L4 2.0LRegular Gasoline212924
2015Config 3 of 5Auto (S6), 4 cyl, 2.4 L4 2.4LRegular Gasoline193023
2015Config 4 of 5Auto (S6), 4 cyl, 2.4 L4 2.4LRegular Gasoline243528
2015Config 5 of 5Man 6-spd, 4 cyl, 2.0 L4 2.0LRegular Gasoline203124

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.

Buick Regal data analysis

How Buick Regal combined fuel economy varies

Across 25 configurations recorded for the 2015 through 2020 Buick Regal, combined fuel economy runs from 22 MPG to 28 MPG. The strongest figure belongs to the 2015 Buick Regal (Auto (S6), 4 cyl, 2.4 L) at 28 MPG, and the weakest to the 2020 car (Auto (S9), 6 cyl, 3.6 L) at 22 MPG — a spread of 27%. A gap that wide means the model year and configuration you buy matter more than the nameplate does: quoting a single number for the Buick Regal would be misleading.

What changed for 2020

Average combined fuel economy for the 2020 Buick Regal is 24 MPG, against 24 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 Buick Regal data

This page lists every 2015 through 2020 Buick Regal record we hold for this measurement — 25 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 Buick Regal numbers

The 2015 through 2020 Buick Regal entries here cover the variants Auto (S8), 4 cyl, 2.0 L, Auto (S9), 4 cyl, 2.0 L, Auto (S9), 6 cyl, 3.6 L, Auto (S6), 4 cyl, 2.0 L, Auto (S6), 4 cyl, 2.4 L and Man 6-spd, 4 cyl, 2.0 L. 2016 is the busiest model year in the record with 5 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 Buick Regal 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 Buick Regal 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 mph35 MPG35 MPG0%
65 mph35 MPG32.6 MPG7%
70 mph35 MPG30.4 MPG13%
75 mph35 MPG28.3 MPG19%
80 mph35 MPG26.4 MPG25%

Our Real-World Speed MPG Adjuster re-scales the Buick Regal 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 Regal MPG

What is the MPG of the Buick Regal?

The Buick Regal gets up to 28 MPG combined (24 city / 35 highway) in the 2020 model year. Fuel economy varies by engine and trim — see the full table above for details.

Which Buick Regal trim has the best fuel economy?

The Auto (S6), 4 cyl, 2.4 L trim offers the best combined fuel economy at 28 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.

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