Related Clues:

• An isometric saturated hydrocarbon found in motor fuel
• Component of fuel to be abandoned at once
• Fuel calculation
• Fuel datum
• At once (anag)
• 87 is a common one
• Component of gasoline
• Number of gas stations?
• 87 or 89, at a gas station
• Chemical in petroleum at once exploding
• A hydrocarbon in petroleum
• 87, say, at the pump
• Employed in the production of petroleum once at Shell
• Petrol has this running at once
• & 21 Across Rating in engine room marrying Commander Brown and Nurse Brown?