Related Clues:

• With 40-Down, H+, e.g.
• Fun time
• Car fuel
• Highway sign word
• It's in a certain range
• It may be noble
• Oil burner
• Tummy woe
• Auto additive
• Semi fuel
• Idle talk
• Mylanta target
• Pretentious talk
• Helium, for one
• Hydrocarbon fuel