2026 Mercedes-Benz GLS450 Review
A fact-led guide to 2026 Mercedes-Benz GLS450, focused on powertrain, published test results, and efficiency.
How this review was built: Vehicle facts come from the records listed below. Instrumented figures are presented as results from the listed source.
Overview
For the US market, published records describe 2026 Mercedes-Benz GLS450 as a vehicle. This review brings together evidence on powertrain, published test results, and efficiency.
Powertrain
Published specifications list the GLS450's turbocharged 3.0-liter inline-six at 375 horsepower and 369 pound-feet, paired with a nine-speed automatic and 4Matic all-wheel drive.
Published Test Results
The listed source's instrumented test recorded 5.4 seconds to 60 mph, a 13.9-second quarter-mile at 100 mph, 0.82 g of grip, and a 178-foot stop from 70 mph.
Efficiency
The listed source's instrumented test observed 22 mpg overall; the article lists EPA ratings of 21 mpg combined, 19 city, and 24 highway for the GLS450 configuration.
What the Test Adds
The instrumented record adds a configuration-specific view of acceleration, lateral grip, braking, and highway efficiency. These results make the review distinct from the official specifications collected on the vehicle page.
Review Scope
This review centers on the configuration identified above. Instrumented results belong to that test vehicle and should not be applied to every trim in the model line.
Buyer Context
Trim and test conditions matter here: pricing and measured figures are most useful when the compared vehicles share a like-for-like configuration.
Evidence Summary
For comparison shopping, powertrain, published test results, and efficiency are the most useful documented points for 2026 Mercedes-Benz GLS450. Match the model year and trim when weighing alternatives.
source-checked · as of Jul 21, 2026
Discussion entries
This discussion combines editorially generated viewpoints with comments submitted by readers.