Not sure why no one has mentioned the idling thing yet. It's bad for the environment and wastes gas. Multiply that by the millions of cars on the road and it adds up.

According to this article, its 6 billion gallons of gas every year (half of which are "normal" cars, the other half being heavy duty stuff) https://www.bloomberg.com/news/features/2021-08-10/can-cities-finally-win-the-war-on-vehicle-idling and that's with almost no one idling at gas stations.