This morning was my first cold morning in the Prius, even got frost on the winder screen. I tried really hard all summer to perfect my driving technique and am getting good figures. But this morning this all went out the window, tried to keep the heater off but had to put it on to clear the screen, engine temperature never reached full temp. Because the engine temp dropped so low it would glide only when it felt like it. Well got an EBH so I better start using it, just experimented a bit in the summer. Better look at blocking up the lower half of the grill (already done the top). Are there any other tips as some of you must have driven in very cold conditions, how do you ever get the engine temp up or will the full blocking of the grill sort that out. Any comments welcomed.