I never change any habits due to gas prices. I have always figured if I am going to spend my most valuable resource (time) doing something. Then I am willing to spend the money to do it.

The economy in general has had a muuuuch bigger affect on my spending habits (including travel). 2 years of operating on the razors edge and I have second thoughts about buying a pack of gum, and then I wonder if I can get by chewing on the gum I already have some more.