You're right. As a normal human we turn on the heater; but as a hybrid mpg optimizers, we use techniques like "30 second blast on high" mentioned by @Wifey'sInsight, passive heating, and jacket/mittens inside the car mentioned by @hasarad to stay warm while maximizing fuel efficiency.When it's cold out (below 39 F), as a normal human we turn-on the heater. Our insight Touring-trim drastically is reduced in mpg. (77mph gives me 32mpg) 😞 yikes. You have to drive 65mph & below to get that 52mpg.