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All excellent posts above !!!
More bad friction examples:
1) Dirty pistons sliding back into the calipers when brake lever is released.
2) Increased stiction of the telescopic tubes and guides of front suspension during hard braking.
3) Power consumed by the pump to force coolant through the pipes, thermostat and radiator.
4) 212 X or O-rings rubbing against the steel plates of a poorly lubricated chain.
5) Intake air and exhaust gases flowing through air filter, throttles, manifolds and exhaust pipes (it is called pumping loses and pistons are the ones doing that work / It involves changes of pressure and volumes of air and gases also, not only friction; just like the aerodynamic loses).
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Motofool 
.................................Never ride faster than your guardian angel can fly
"Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí
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