Which combination correctly pairs a fuel with its ignition temperature range?

• A. Avgas; 100 to 165F
• B. Jet-A; -50 to 30F
• C. Jet-A; 100 to 165F
• D. Avgas; -50 to 30F

Answer: (D)

The key idea here is how fuels ignite based on their ignition (flash) characteristics, which depend on how readily their vapors form an ignitable mixture with air at different temperatures. A fuel with a lower ignition point will ignite at colder ambient temperatures, while a fuel with a higher ignition point requires warmer conditions or more energy to reach ignition.

Avgas has a lower ignition point than Jet-A, so it is capable of igniting at colder temperatures. The pairing that places Avgas with a range spanning very cold conditions up to about 30F aligns with that property, reflecting that Avgas can form ignitable vapors even in colder environments. The other pairings suggest ranges that either don’t fit Avgas’s or Jet-A’s typical ignition behavior or include an unlikely high-temperature range (100 to 165F) for this context.

So, the correct match is Avgas with -50 to 30F, which best represents how its ignition characteristics behave across a cold-to-milder temperature window.