If you are one of the people who gets shocked on your car doors then dont ever open or shut your car door when filling your gas tank. A few months ago at a gas station near here a guy was filling a can in the back of his vehicle and had slide the can across the carpet in the vehichle.....somehow he did this as he started pumping his gas and the static electricity combined with the gas or the fumes caused a huge fire. Thats why they have all those little stickers on the pumps asking that you not leave the pump unattended and to always fill your portable tanks outside your vehicles.