Gas prices hit $4 a gallon in all 50 states for the first time

It's an inauspicious record: For the first time, gas prices in all 50 U.S. states have hit an average of at least $4 per gallon, according to data from AAA, formerly the American Automobile Association.

It's happening as global crude oil prices trade near $110 a barrel, and, while that price is below the recent highs seen in March, the elevated national average gas price could signal higher highs ahead of the summer travel season. AAA said as refiners switch to the more expensive "summer blend" of gasoline, the seasonal formulation...