 The final weekend of June has brought a slight increase in gas prices to Delaware. AAA Mid-Atlantic says gas is selling for a per-gallon average of $3.49, up 3 cents from last week and 14 cents higher than last year. The national average is $3.50. Oil has gone over $80 a barrel. Demand for gas is expected to grow over the next couple of weeks. That may impact prices at the pump. AAA has already projected record travel volumes