I love slowing down and seeing the needle drop to EV, sitting at stoplights with no gas engine running, etc. What I can't figure out is why this sometimes does not happen. Normally, anytime I slow to 30 mph the FEH goes into EV mode. Once in awhile, though, I can't MAKE it go into EV mode. Even when I come to a complete stop the gas engine keeps running. I can't see anything different. The ambient temperature is the same as it was the day before (when the FEH went into EV mode regularly), I've been driving the same as always, the message center says the available energy is NORMAL (I've never seen it say LOW), the vehicle has been running long enough that the engine is definitely warmed up, and I'm not running AC or defrost.

Does anyone have any idea why this happens? I don't have the NAV system so I have to rely on the message center for my information. When this happens it goes on for most of my drive to work or home again (a 35 minute drive). It's very frustrating. I keep thinking of all the unnecessary gas I'm using!