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@hippy
Losing body weight rather than using a lighter bike has more than just the weight advantage.
Your body doesn't need to work as hard to propel itself since it has less tissue to push blood around.
You operate at a lower temperature. You are probably presenting a smaller profile to the wind so you are more aerodynamic. Your legs, if carrying excess fat are moving = more work and there's probably lots more but I'm not a sports scientist or anything so ask one of them instead.