It's doesn't actually evaporate. They vaporize the fuel when jettisoning it and it more or less and it stays as small droplets suspended in the air. They say above 5000' so it has time to disperse in the air prior to reaching the ground so it's not a concentrated amount.Evaporation: jet fuel will evaporate. When jettisoning, the accepted norm is to be above 5,000 feet to allow it to evaporate before ground contact.
Now, what will it do to a turbo/super-charged hemi? THAT is a question that I cannot answer.