Related Clues:

• Post-dinner issue
• Car-tank filler
• Guzzled product
• Petroleum derivative
• Brit's gas
• Really fun time
• Marsh emanation
• Type of locomotive
• Pipeline contents
• Phase hotter than liquid
• Prince Philip's fill-up?
• Helium e.g.
• Nitrous oxide, for one
• Word with ''mustard'' or ''natural''
• Ethane, for one