Mathias:
I sent you an email (at least, I tried) yesterday with a gpl file with a 33 mile bike ride that showed approximately 8,500 feet of elevation gain. My bike computer/altimeter (Cateye older model but pretty accurate) showed about 1,600 feet.
You can try your new method on it and report back.
As I wrote above, I can see your method picking up minor undulations in the road (up a foot, down a foot, up a small two feet, down a foot, etc) which could really add up even when the terrain feels flat. And depending on where the BB is located (I had mine in a hip pouch), each time I stand on the pedals and lower myself, could be added to elevation gain and that is probably not reflective of reality.
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