Gas prices go back upPosted: Updated:
Gas prices could rise to as much as $3 a gallon nationally by the summer, analysts say.
As the weather gets warmer, suppliers must switch from winter-grade oil to summer grade, according to the AAA. Gas used in the summer is typically cleaner, less volatile and costs more to refine.
City drivers are already paying close to $3 for gas as prices have risen by 17.3 cents in the last month. However, demand has decreased as more people start to conserve, AAA says.