I'm considering buying a Clarity or a new Volt. When the Volt runs in EV mode it never runs the gas engine unless the outside temperature is -10 deg C (or 0 deg C - driver selectable). I don't know the rules for the Clarity and I'm curious. Last week it was -10 deg C and on the Clarity test drive with a fully charged battery, the gas engine ran frequently, even if I was gentle with the gas pedal. In some blogs I read that Honda require the gas engine to run at cold temperatures (below 10 deg C) Today it was+3 deg C and I had another test drive with a fully charged battery. The gas engine stayed off until the first time I went past the gas pedal detent (as expected) but then didn't switch off for approx 5 mins. While it was running, I stopped the car, switched it off and then back on. The gas engine stayed off. I then went on a highway and accelerated moderately to 70 mph and the gas engine came on and stayed on. When I left the highway back onto smaller roads, the gas engine stayed on for a few minutes and then went off and on for no apparent reason. Does anyone know the logic that the Clarity uses for running the gas engine? Curious.