Thanks again Lewis,
I don't have a HAH, but like to learn what I can. I think you answered my question. Basicly I was seeking out how much ability the driver had in manipulating the cylinder deactivation for maintainance of maximum fuel economy. Sounds like it's fairly easy to do and that there's enough physical and visual feedback to allow it to be accomplished.

Evan E. Fusco, MD
'04 Prius/BC moded to the T
'06 Highlander Hybrid Limited AWD w/NAV