Related Clues:

• Mason Williams' ''Classical ___''
• With 79-Down, fuel-inefficient vehicle
• Oxygen, for one
• Braggadocio
• Accelerator?
• Ozone, for one
• Argon or neon
• Refined fossil fuel
• 'What a ___!'
• Jupiter, mostly
• Argon, for one
• Post-dinner issue
• Car-tank filler
• Guzzled product
• Really fun time