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Combined MPG
18–21 MPG
55% city / 45% highway weighted
City Driving Rating
16–19 MPG
Stop-and-go urban cycle
Highway Driving Rating
21–23 MPG
Sustained open-highway test
Annual Fuel Cost
$3,600–4,200
EPA estimate @ 15,000 miles/yr
Laboratory Fuel Economy Certification

Executive Efficiency Findings

The 2020 Mercedes-Benz GLS delivers an EPA-certified 18–21 MPG combined across 2 configurations. Estimated annual fuel costs range from $3,600 to $4,200.

EPA Testing Standards: Ratings derived from official dynamometer laboratory tests under 40 CFR Part 600. Real-world fuel economy varies based on driving style, ambient temperature, cargo payload, and terrain.
Certified Powertrain Attributes
  • • Certified Configurations: 2 trim and powertrain permutation(s).
  • • Combined Rating Range: 18–21 MPG.
  • • Hybrid Efficiency: Up to 21 MPG combined.
  • • Annual Energy Cost: $3,600–4,200 (15k mi/yr).
Certified Ratings Matrix

Official EPA Fuel Economy Ratings by Configuration (2)

Laboratory certification test values across engine, transmission, and drivetrain permutations

Configuration / Model Powertrain Drivetrain Transmission City Highway Combined Annual Fuel Cost CO2 (g/mi)
GLS450 4matic Premium 3L Hybrid 4-Wheel Drive Automatic 9-spd 19 MPG 23 MPG 21 MPG $3,600 —
GLS580 4matic Premium 4L Hybrid 4-Wheel Drive Automatic 9-spd 16 MPG 21 MPG 18 MPG $4,200 —
Operating Cost Economics

Standardized Energy Cost & Consumption Benchmarks

Standardized annual energy consumption and operating cost metrics based on 15,000 annual miles

ENERGY UNIT 25 MI

Fuel Cost per 25 Miles

$4.17–$4.86

Based on $3.50 per gallon regular gasoline

ANNUAL TOTAL 15K MI

Annual Fuel Consumption

714–833 Gal

Estimated annual energy units needed for 15,000 miles

5-YEAR VALUE SAVINGS

5-Year Fuel Cost vs Avg Vehicle

EPA Benchmark

Compared to the average new vehicle over 5 years

Related Workstations

Related Official Reports for 2020 Mercedes-Benz GLS

Cross-reference safety ratings, owner defect complaints, and recall campaigns

← 2020 Mercedes-Benz GLS Overview

Vehicle summary, specifications, and primary KPI metrics.

2020 Mercedes-Benz GLS Safety Ratings →

NHTSA 5-Star NCAP crash tests, rollover risk, and active driver assistance.

2020 Mercedes-Benz GLS Owner Complaints (38) →

NHTSA consumer defect complaint filings by affected component.

2020 Mercedes-Benz GLS Safety Recalls (24) →

Official safety recall notices, defects, and free repair instructions.
Search Intelligence

Quick Answers: EPA Fuel Economy, Electric Range & Energy Costs for the 2020 Mercedes-Benz GLS

Direct, deterministic answers synthesized from verified United States government databases for the 2020 Mercedes-Benz GLS

What gas mileage (MPG) does the 2020 Mercedes-Benz GLS get?

The 2020 Mercedes-Benz GLS achieves an EPA-certified rating of 18 to 21 MPG combined across 2 certified configuration(s).

City ratings range from 16 to 19 MPG, and highway ratings range from 21 to 23 MPG.

Source: EPA FuelEconomy.gov (40 CFR Part 600)

What is the estimated annual fuel or energy cost for the 2020 Mercedes-Benz GLS?

Using AutoUtility's standardized operating cost model, estimated annual fueling and energy costs range between $3,600 and $4,200 for the 2020 Mercedes-Benz GLS.

Calculated under AutoUtility's standardized methodology (15,000 miles per year, 55% city / 45% highway driving, $3.50/gallon regular gasoline, $0.16/kWh electricity) using official EPA dynamometer consumption ratings.

Source: AutoUtility Operating Cost Model (EPA-Certified Baseline)
Official US Government Data Provenance

Fuel economy ratings, electric range figures, and energy cost estimates on this page are retrieved directly from the United States Environmental Protection Agency (EPA) and U.S. Department of Energy (FuelEconomy.gov) certified vehicle database under 40 CFR Part 600.

Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.