At least one person is predicting $4/gallon soon:
Consumers can expect retail gas prices to rise to $4 a gallon in the near future, Ben Brockwell, director of pricing at the Oil Price Information Service, said Wednesday. "There’s no question gas will hit $4 a gallon," he said. "The question is how high will it go and how long will it last?"
CNN.com – Conditions deteriorate in Katrina’s wake – Aug 31, 2005