If you only watch the video, you will miss some important details provided in the article. While the G2 RL returned decent mileage, it was towing a smaller, lighter, and more aerodynamic trailer than the Duramax Canyon:
2017 Honda Ridgeline AWD Highway Towing MPG Loop Review [Video] - The Fast Lane TruckWe hitched a 4,800 lbs CM Trailers Stocker to it and ran our standard 100-mile highway MPG loop. This particular trailer weight basically maxes out the Ridgeline.... However, the trailer itself is narrow enough to see around in a midsize truck and reduces aerodynamic drag with a curved front section.
The best ever towing highway MPG we ever got was in a 2016 GMC Canyon Duramax at 12.3 MPG, and that was a larger and heavier trailer (5,600 lbs). Can the Ridgeline beat it with a smaller trailer?
Spoiler alert: the Ridgeline got 11.5 MPG at the pump, which is a very respectable result, considering that we run all of our highway towing tests at 70 MPH.