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This reminds me of a Top Gear segment where they had a Toyota Prius go up against a BMW M3, they were measuring fuel economy. The Prius went around the track as fast as it could and the M3 followed it.
The result was that 1) the M3 didnt have any issues keeping up with the Prius (not suprising) 2) the M3 used about 30% less fuel than the Prius in doing so.
Upshot, a G-11 at 40% load will perform way better than a GM-8 at 80% load. The G-11 isnt much more time consuming to setup than a GM-8, and I doubt you are carrying it on the back of a push bike so weight shouldnt be too much of a consideration.
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