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Residence time is not just for molecules.
Energy flowing through a vehicle resides for a time as kinetic energy
in its mass. This residence time can be calculated easily. It turns
out that the average residence time of an infinitesimal fuel energy
element in the driver of an automobile at constant highway speed is
about 400 ms. As explained in my Knol, this time is also a measure of
vehicle performance that is proportional to deviation from the
Gabrielli-von Karman limit line.
http://knol.google.com/k/speed-costs-power#
Although there is much discussion about modeling power as a flow, I
have not found references to this idea in the literature. Has anyone
seen this before?