Related Clues:

• Recyclable container
• Like a useless gas tank
• Devoid of contents
• Bottle to recycle
• Opposite of full
• Pointing to E
• Like idle words
• One end of a gas gauge
• Containing nothing
• Uninhabited
• Frazzled
• Ready for a refill
• Totally drained
• Jackson Browne's "Running on ---"
• It's hard to run on it