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There's also the possibility that $3/gallon isn't the "pain point" for a lot of people. Perhaps at $5/gallon, the majority of people will realize that they have to do something (e.g., change how they drive, get a more efficient car, modify their car to be more efficient, drive less).
Of course, it could also be that if prices creep up slowly enough, we won't notice to the point of actually changing anything. (Sort of like the "frog in boiling water" thing; change the temperature slowly enough and the frog doesn't appear to notice.) A similar effect can happen with faster price increases, if the price goes waaaaaay up and then comes down somewhat. Sort of like what has happened recently....
-soD
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