Spring has sprung – and drivers are seeing no relief at the gas pumps as prices have increased by 5 cents since last week in Delaware.  The national average is up 2 cents from a week ago to $2.83.  In Delaware the price at the pump increased from $2.58 last week to $2.63 today.  AAA Mid-Atlantic officials say demand for gas and a decrease in crude oil and gasoline supplies nationwide are pushing the price at the pump higher – just in time for the holiday weekend.  Energy Information Administration officials are expecting US regular-grade gas to average $2.76/gallon through September, which is lower than last summer’s average of $2.85/gallon.