Related Clues:

• Oven fuel
• Fill-up fluid
• Big expense for truckers
• Roadsign, perhaps
• 4-Down, e.g.
• Beetle juice
• Beetles go nowhere without it?
• Oil or gas, e.g.
• Empty blather
• Stomach problem
• Combustion need
• Element like 8-Down
• Helium, e.g.
• Main contents
• Road-sign word