AAA found that 59 percent of respondents to its survey in February said they would change their driving habits or lifestyle if the cost of gas rose to $4 per gallon.
The national average has passed $4 since the survey was administered, AAA noted.
The organization conducted 1,051 interviews for the survey.
AAA said three-quarters of respondents said they would adjust their lifestyle if the price reached $5 per gallon.
Eighty percent of the people who said they'd make changes based on higher prices said they'd drive less by carpooling or reducing shopping or dining out.
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