Habits die hard. Heating your car engine (in the winter) is no longer necessary, for instance.
It is not uncommon to hear the engine roar in the morning in the parking lot. Why? we could understand that 20, 30, 40 years ago the engine needed to “turn” or heat a little to allow better combustion and better lubrication, but for 10 years, at least, the engines are optimized for optimum efficiency at the first turn of the key. So make it a habit to start quickly and leave immediately. The first 5 miles of your trip are always the most energy-consuming. So the less you wait, the more you save.
And even if it is hot outside and you want to cool down the car before leaving, the best way, the most effective and most economical, is to lower the windows and start driving to let the air flow. Then you can start the air conditioning, moderately.
Good road and see you tomorrow.