Mercedes-Benz GLB-Class Fuel Economy (MPG)

Name: Mercedes-Benz GLB-Class MPG & Fuel Economy
Creator: AutoSpecData
License: https://creativecommons.org/licenses/by/4.0/

What is the real-world gas mileage of a 2026 Mercedes-Benz GLB-Class?

The 2026 Mercedes-Benz GLB-Class gets up to 28 MPG combined (25 city / 33 highway) in EPA testing.

Latest model year (2026):

The Mercedes-Benz GLB-Class gets up to 28 MPG combined (25 city / 33 highway) in the Auto (AM8), 4 cyl, 2.0 L trim.

Verifiedfueleconomy.gov · Verified August 11, 2026

Overview MPG Engine Specs Fuel Cost Transmission Drivetrain Vehicle Class Maintenance Dimensions Curb Weight Safety

Mercedes-Benz GLB-Class MPG — All Years

Year	Trim	Engine	Fuel	City (MPG)	Hwy (MPG)	Combined (MPG)
2026Config 1 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	25	33	28
2026Config 2 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	24	33	27
2026Config 3 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	21	27	23
2025Config 1 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	24	33	27
2025Config 2 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	25	33	28
2025Config 3 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	21	26	23
2024Config 1 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	21	26	23
2024Config 2 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	25	33	28
2024Config 3 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	24	32	27
2023Config 1 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	21	27	23
2023Config 2 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	22	30	25
2023Config 3 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	24	32	27
2022Config 1 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	20	27	22
2022Config 2 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	24	32	27
2022Config 3 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	22	30	25
2021Config 1 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	23	31	26
2021Config 2 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	23	30	26
2021Config 3 of 3	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	21	26	23
2020Config 1 of 2	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	23	31	26
2020Config 2 of 2	Auto (AM8), 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	23	30	26

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.

Mercedes-Benz GLB-Class data analysis

How Mercedes-Benz GLB-Class combined fuel economy varies

Across 20 configurations recorded for the 2020 through 2026 Mercedes-Benz GLB-Class, combined fuel economy runs from 22 MPG to 28 MPG. The strongest figure belongs to the 2024 Mercedes-Benz GLB-Class (Auto (AM8), 4 cyl, 2.0 L) at 28 MPG, and the weakest to the 2022 car (Auto (AM8), 4 cyl, 2.0 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 Mercedes-Benz GLB-Class would be misleading.

What changed for 2026

Average combined fuel economy for the 2026 Mercedes-Benz GLB-Class is 26 MPG, against 26 MPG for the 2025 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 Mercedes-Benz GLB-Class data

This page lists every 2020 through 2026 Mercedes-Benz GLB-Class record we hold for this measurement — 20 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 Mercedes-Benz GLB-Class numbers

The 2020 through 2026 Mercedes-Benz GLB-Class entries here span 7 model years of published measurements for this figure. 2026 is the busiest model year in the record with 3 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 Mercedes-Benz GLB-Class 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 Mercedes-Benz GLB-Class 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	33 MPG	33 MPG	0%
65 mph	33 MPG	30.8 MPG	7%
70 mph	33 MPG	28.7 MPG	13%
75 mph	33 MPG	26.7 MPG	19%
80 mph	33 MPG	24.9 MPG	25%

Our Real-World Speed MPG Adjuster re-scales the Mercedes-Benz GLB-Class 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 GLB-Class MPG

What is the MPG of the Mercedes-Benz GLB-Class?

The Mercedes-Benz GLB-Class gets up to 28 MPG combined (25 city / 33 highway) in the 2026 model year. Fuel economy varies by engine and trim — see the full table above for details.

Which Mercedes-Benz GLB-Class trim has the best fuel economy?

The Auto (AM8), 4 cyl, 2.0 L trim offers the best combined fuel economy at 28 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.