I was running late for a meeting, and I only had a couple of minutes to grab lunch on the way. Well I wasn't really late, as our meetings never seem to start on time - but that is a subject for another day.
Since I was pressed for time, I stopped by McDonald's. I ran into the restaurant rather than going through drive-through. I remember reading some tips to save gas, and skipping drive-through is a good one. Roughly 7 cars were in line, all of them idling for 7-10 minutes. You can do the math on their gas mileage for those 10 minutes. As an added bonus there was no one in line inside, so I was in and out in a minute or two.
So next time your grabbing lunch, stopping by the bank, or getting your coffee consider hopping out of your car and saving some gas.