Related Clues:
- Nitrogen, say
- Protostar makeup
- Road sign word
- Laughing stuff?
- Plasma's kin
- Product of digesting too much Taco Bell, maybe
- Fall over fuel
- Combustible fluid
- Argon, e.g
- What some cars guzzle
- __-guzzler
- Certain fuel
- Up in the Air found in megastore
- Element in the penultimate column of the periodic table
- With 47-Across, car's tank top