I am by far not an expert in Prius Drivetrain, but I would think that it may not matter with a prius because the Prius should disengage the tranny when coasting, since it was designed for that. The only thing that would slow down a prius during a coast is the regenerative braking, IMO. By switching into neutral you may by pass that system, which would be beneficial, but you would also eliminate the regen braking which may not be so good.
This of course is all theoretical ...
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Thx NoCO2; "The biggest FE mod you can make is to adjust the nut behind the wheel"
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If your knees bent in the opposite direction......what would a chair look like???
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