I had the opportunity to drive some fairly hilly terrain this last weekend (not quite as hilly as WV though). I pretty much abandoned the CC altogether. Uses too much gas going uphill and too gentle going down on the other side. I instead tried to adopt a method of trying to hold the FE gauge in a fixed position in the 45-55mpg range going downhill gaining speed and then try to maintain that FE going uphill as the speed bled off (up to a point).

The thought occurred to me while I was fiddling with the CC at first. I began to wonder if when in CC going downhill, if the TCH automatically applied more regen braking to prevent the car from exceeding it's set speed. I was going to experiment with this, but thought of it too late and ran out of steep enough hills on the way home. Any thoughts on this?

I also noticed that after a good downhill regen giving the battery a max SoC, the TCH becomes extremely generous with battery assist. Pretty much anything I did except coasting became battery assisted until the SoC dropped back 1 bar. I found I could drive level roads at 55/60mph for up to 1/2 mile or so with an indicated 70-90mpg with power from both ICE and Battery after coming off a good decent (converted, the metric FE gauge extends beyond 60mpg because it works in reverse).

Two climate control systems, one inside and the other at the tailpipe.

2007 Camry Hybrid (in service June 2006)
FE: 6.67L/100km or 35.3 mpg (6.11L/100km or 38.5 mpg in summer)