A gallon of regular gas costs just under $3.05 on average across the United States, according to AAA. That’s up from $2.89 a month ago and $1.97 a year ago.But some Americans are feeling more pain at the pump than others. California has by far America’s highest gas prices — $4.20 a gallon. Hawaii’s the only other state in the same ballpark, with regular gas prices averaging $3.93 a gallon.Other West Coast states are also some of the country’s priciest