Want to conserve gasoline? Turn it off! Don’t let you car sit in idle. Because our daughter would often fall asleep in the car, I would use drive thru windows for banking, dry cleaning, etc. I would go to these places during off peak hours and would turn the car off as soon as I arrived at the window. I didn’t have to pull our daughter out of the car to run these errands and was still able to conserve gasoline.