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J
http://3.bp.blogspot.com/-I-Pj_jhBwnA/T44XFuogPjI/AAAAAAAAAL4/D7rzV2zOWr0/s1600/running+energy.gif
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J
http://media.wiley.com/mrw_images/compphys/articles/c110007/image_n/nc11000722.jpg
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J
With a reasonably high Vo2max (clean or doped) your gross efficiency would be higher at 500W than 200W. Just sayin'