Gas prices across the Tristate are up again. In Evansville , the price of regular unleaded jumped to $3.79 a gallon, up more than 20 cents from Wednesday. The national average price for a gallon of unleaded is $3.65. Some analysts are predicting prices to soar above the $4 mark in the next couple of weeks. Today the price of oil shot up to $123.00 a barrel.