Related Clues:

• Nitrogen, e.g.
• Fuel for some ranges
• Service-station buy
• What you might get with a bean burrito
• Convenience store buy
• Engine's must-have
• Empty words
• Driving demand
• "Fill 'er up" filler
• Lot of fun, slangily
• Interstate sign word
• Supply for regular customers?
• It's between E and F?
• The ''it'' in ''Step on it!''
• Type of stove