2021 Mercedes-AMG GLS 63 – Real-world Highway MPG Test

EPA ratings have been released since we shot this! The brutally quick GLS 63 is rated for 18 MPG, but as you'll see here, we were able to best that number by a notable percentage. Pretty impressive for something this big and fast! Burmester sound-system review:    • 2021 Mercedes-AMG GLS 63 – Burmester 13-sp...   Full review:    • 2021 Mercedes-AMG GLS 63 – Test Drive and ...   Please hit that subscribe button if you enjoy! If you have any questions on the car or any cars you'd like to see, let us know in the comments. Check out our website for written reviews and content: thedailymotor.com Intro music by Skyler Benn. #Mercedes-AMGGLS63 #2021Mercedes #RealWorldMPG