What sustained price for gasoline would cause you to cut back on other household spending?
The graph above shows the on-going results of the non-scientific study. You can chime in, too, at http://forums.wsj.com/viewtopic.php?t=805.
As consumers cut back spending, the economy slows down which generally leads to lower mortgage rates and weaker housing markets as a result of job losses. According to GasBuddy.com, some areas of San Francisco are already topping $3.50/gallon.