Related Clues:

• Hoot and a half
• Gusher's gush
• Olive __
• It can follow the first word of 17-, 26-, 37-, 50- and 60-Across
• Kuwait export
• Flivver fuel
• Methane, for one
• Alberta Gold
• Ethane or methane
• Driller's quest, often
• Methane, e.g.
• Pump stuff
• Electric alternative
• Nitrogen, for one
• Bug juice?