I've noticed that many people when going to the mall drive around and around to find a parking place close to the entrance OR they sit with the car idling to run the air conditioning. Not a bad idea to hit a parking space way out and, are you ready for this?, walk. Ok, so you save a half a cup of gas. Not much but, multiply that by a a gazilion cars and maybe it does add up. Saving gas, not breathing exhaust fumes and walking. It's all good.