I do use pulse and guide. My driving is predominantly on the highway...20 of the 22 miles each way. The only limiting factor with the pulse and glide as far as I am concerned is that my drive has a lot of ups and downs. Cannot pulse and glide when I am going up an incline(atleast I have not figured out a way to do it yet.. ). I have been using the AC in eco mode all the time. I live in Western PA-the terrain is not flat and the temp in the daytime has not dipped enough to turn off the a/c.