Hot summer days around these parts means 85 F. I usually don't use A/C as long as the air is dry but lately the air has been very humid. I don't have hardly any experience using A/C at highways speeds, but over the last couple of days I've noticed it takes quite a bit more attention to get the car to go into E-mode when the A/C (in ECO) on. In spots where I often cruise for long stretches in E-mode I've found the car will start the ICE even though SoC is not low. At times when I encourage E-mode by backing off the pedal, reapplying the pedal will start the ICE again. Sometimes a second attempt will keep it in E-mode. It will also turn on the ICE sooner when beginning up a gradual hill. I notice a significant FE loss in my commute as I'm not able to get as much of my infinite mpg fix, which I rely on greatly to balance portions of my commute that are FE poor.

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)