The most commonly used aviation gasoline ("Av Gas") is 100LL utilized insmaller, general aviation airplanes. The actual combustion temeprature is highly variable due to operating temperature changes, cooling and other factors, but a generally accepted temperature is, in real life, (not test conditions) the unburnt "end gases" ahead of the flame front encounter temperatures up
to about 700C due to compression and radiant and conductive heating, and commence a series of pre-flame reactions. The resultant combustion temperature of the newly injected gas/air envelope mixture can began flame propagation at 400C and then reach 600C before ejection on the exhaust stroke...