[Arcy]

This is nothing more than a jet in need of a tuneup and some higher octane fuel. The puffs of vapor are miniature backfires from the jet engine.

[El Gato]

This is nothing more than a jet in need of a tuneup and some higher octane fuel.

ROTFLMAO!

Jets just don't work that way. Jet A and JP-8 are pretty high octane to begin with, since they are essentially kerosene or light diesel fuel. Early jet fuels had more of a gasoline component, but not the current ones, ... except some "special fuels" for "special aircraft" such as that for the SR-71, which was actually lower volatility than standard jet fuel (it was used for cooling before being burnt).

Jets can have fuel and air flow problems but those are essentially unrelated to the "octane" of the fuel.