The national average gas price is hovering just under $4 per gallon, at $3.981. But almost a third of the country (110.8 million people) lives in states that have crossed that psychologically significant threshold.
High prices are hitting Americans west of the Rockies hardest. The average gallon of regular gas is $5.83 in California, $5.32 in Hawai'i and $5.30 in Washington, according to AAA.
Arkansas' average price is $3.39, one of the best in the U.S.
Before the war began, only three states — California, Washington and Hawai'i — had gas prices above $4.