I despise the idiots who came up with headlights that come on when you start your car, regardless of whether you turn them on or not. Fortunately, my car doesn't work that way, but a significant number of cars do. The "safety boost" for this "feature" is almost non-existent on a sunny day. When it's raining, fine, turn on the headlights. Turn them on when the sun gets low in the sky, but on a normal day this is a horrific waste of energy. For something like one of the small Honda Civics, having the headlights on will cut the mileage by something like 10%, and even for an SUV it can make a difference of 2-3%. It falls into the "Let's all waste our lives away worrying about how to live longer" category.