Gas prices shot up in New Jersey and around the nation amid increasing demand and rising oil prices. AAA Mid-Atlantic says the average price of a gallon of regular gas in New Jersey on Friday was $4.37, up 20 cents from last week. Drivers were paying $2.98 a gallon on average a year ago at this time. The national average price for a gallon of regular gasoline was $4.27, up 12 cents from last week. Drivers were paying $2.94 a gallon on average a year ago at this time. Analysts say crude prices are unlikely to fall as long as the supply remains tight. Tracy Noble, spokesperson for AAA Mid-Atlant…