It is. I don't know what you know about Honda's VCM but it allows the V6 to operate on 6, 4, or 3 cylinders. It does so automatically based on several inputs, as far as I can tell.
It seems to follow an instantaneous MPG tracker's behavior fairly closely. Heavy throttle, heavy acceleration, going up hills, etc. all switch the VCM system off. Highway coasting, light throttle, coasting down a hill, etc. all switch it on.
Again, I've never looked down expecting it to be on or off and been surprised.
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