Related Clues:

• Type of oil
• Welcome road sign
• Gasohol, e.g.
• Hipster's great time
• Refined crude
• Flat's lack
• Simple tune
• Well-known Alley
• Source of energy
• Tank contents
• Fuel for a Zeppelin
• It may be hot, cold or thin
• Natural resource
• Play on TV
• Pipe contents, maybe