I am a "news nut" and browse all of the different networks' pages practically daily. I am also a commuter who drives an SUV (yes, I know, poor choice of automobiles at this time) so gas prices are concern for me.
On June 2, I read an article named "OPEC Chief calls for higher oil output" at MSNBC.com that talked about the rise in gas prices and how it hasn't deterred many people from purchasing. There was also a graph depicted showing that between 1970-1981 people did lay off buying gas when the price rose. I believe that this would fall under the trade-off idea in the fact that there is a trade-off between gas prices and autonomy (driving oneself).
Today at http://money.cnn.com/2004/03/29/news/economy/gas_prices/ is another article that talks about the rise in gas prices and demand has remained constant. Check it out, and others like it, because if you are an autonomous automobile driver this may concern, or intrigue, you!