HARTFORD, Conn. (WFSB) - Gas under $4 per gallon is impossible to find in Connecticut, but just a few minutes away in Massachusetts, drivers are filling up for significantly less.

At a Mobil station on Elm Street in Enfield, gas was selling for $4.90 per gallon. At a Pride gas station in Agawam, Massachusetts, gas was priced at $3.95 per gallon.

The nearly dollar-per-gallon difference has Connecticut drivers crossing state lines to fill up.

Randy Paz was returning to Plainville from Vermont when he intentionally stopped at the Pride gas station in Agawam.

“It’s kinda crazy I’m glad I caught this,” Paz said. “I figured I’d get gas here before I get down there. It’s horrible. I don’t like it.”

Robert Morassi, who lives in Agawam and works in Hartford, said he never gets gas in Connecticut.

“It is amazing this is under $4,” Morassi said. “Emergency, if you’re running really low yeah, but no. I live in Mass why would I pay that extra money in Connecticut. No, no.”

Several factors push Connecticut gas prices above Massachusetts.

According to Michael Fox at the Gasoline and Automotive Service Dealers of America, it starts with taxes.

“You do have a major difference in taxes, gasoline taxes, as a whole between CT and MA. That accounts for about 40 cents a gallon,” Fox said.

There is another 30-cent difference between branded and unbranded gasoline, according to Fox. Branded companies like Mobil, Shell and BP charge a premium for their product and have higher costs because they drill and explore for the product.

The farther a gas station is from the two major oil terminals in New Haven and Bridgeport, the more it costs to have the oil delivered. The longer the delivery trip to a station like the one in Enfield, the more drivers pay.

“Distributors and oil companies will charge a different price, for the exact same product on the exact same day out of the exact same terminal,” Fox said. “There’s going to be a huge transportation difference because they have to travel so far to bring it to that station.”

The state averages close the gap somewhat. Connecticut’s average gas price was $4.58 per gallon, while Massachusetts averaged $4.42 per gallon.