When it comes to filling your gas tank, leave a little room for the tank to breathe. Continuing to fill the tank, after that first click of the nozzle when the pump shuts itself off, allows raw gas to enter the car's vapor recovery system. In hot weather, overfilling can be dangerous. The heat causes vapor to expand, and the tank needs some 'breathing room.' This can cause gasoline to leak back out of the tank through the filling tube, and creates a safety hazard by spilling onto the ground. You can cut down trips to the pump altogether by driving smart. Avoid sudden starts and excess idling. Keep constant speeds and use the air conditioner sparingly.
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