Connecticut drivers might be in for a shock the next time they fill up after a gallon of regular gas jumped 20 cents from last week, according to AAA Northeast. The state average is $3.70 a gallon, which is up 28 cents from one month ago.

“The biggest contributing factor to this increase in price is the switchover from the winter blend fuel to the summer blend fuel which is more expensive to produce,” explained Jillian Young, director of public relations for AAA Northeast. “That, coupled with a pretty busy travel month in April between spring break and the eclipse is what drove prices up.”

AAA looked at Connecticut’s six metro areas and found the Greater Bridgeport metro area had the most expensive gas in the state with an average of $3.75, followed by Lower Fairfield County and Windham at $3.74. The Greater Hartford metro, New Haven/Meridan and New London/Norwich all have an average of $3.68, according to AAA.

News 12 found gas prices from $3.63 to $3.99 on Connecticut Avenue in Norwalk. The I-95 north rest stop in Darien had a gallon of regular for $3.87.

“It hurts the bank sometimes, but what are you going to do? You’ve got to keep moving, right?” said one driver who was filling up at the rest stop.

“It's crazy. I mean it's hard enough. The price of everything is skyrocketing, you know. I can barely keep the tank full,” said another driver there.

Young said the large spikes shouldn’t continue as demand goes down.

“It's not unusual to see a little lull in demand between spring breaks and Memorial Day travel, which is when we see a lot of demand. We're also seeing regional gasoline inventories above last year's levels so those are all things that can help with price,” Young told News 12.

Connecticut is listed as 14 among states with the highest prices in the country, according to AAA, which said the national average is $3.67.