Hybridbob writes:First, as the weather has turned cold (below 20 F.) the MPG has dropped from about 36 to 30. This seems totally temperature related. I haven't changed my driving style but the mileage has dropped 20%.
Bob, I looked the other day in my TCH repair manual and it states the starting and shuting down of the ICE is controlled by oil temp. It would take longer for the oil temp to get up to normal than the coolant temp at -20, hence the lower fuel milage in the cold as the ICE runs more.
