Related Clues:

• Supply for regular customers?
• It's between E and F?
• The ''it'' in ''Step on it!''
• Type of stove
• Balloon content
• Truck-stop purchase
• Nitrogen or oxygen
• Word repeated in "Jumpin' Jack Flash"
• Sign along an interstate
• Vacation expense, maybe
• One of the states of matter
• Helium or hydrogen
• Service-station commodity
• One of the three states of matter
• Ford filler