Interesting info, thanks. I've always been curious about the coolant systems in the car (ie the ICE coolant system vs the hybrid coolant system). Things like which one has more capacity, whether the hybrid system has any kind of thermostat (do electric motors run better at a regulated temp, does it care if it's cold unlike the ICE?), what components are actually temperature controlled, etc. Any interesting info about that in the repair manual?

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

2007 Camry Hybrid (in service June 2006)
FE: 6.77L/100km (34.8 mpg) over 37750km (23450mi)
75% city - Ave trip 20 min - 2 Winters