| Motorists taking a drive over the Labor Day weekend will be paying more to fill up at the pump.
Gasoline prices are already spiking, oil executives blaming it on Hurricane Issac.
Drivers in much of the country were hit with the biggest one-day jump in gasoline prices in 18 months.
While the national average has been at $3.80, prices in Charleston went to $3.99 a gallon for regular unleaded.
Oil companies say that Hurricane Isaac knocked out about a million barrels per day of refining capacity. | 
