Related Clues:

• Not hollow
• Idle talk
• Mylanta target
• Pretentious talk
• Helium, for one
• Hydrocarbon fuel
• What to 'fill 'er up' with
• The 'it' in 'Step on it!'
• Antacid target
• Bunch of fun
• Alternative to oil
• Civic need?
• Exxon product
• Dense
• Really good time