COLUMBIA, S.C. (AP) — Drivers around the South rushed to fill their gas tanks Friday as prices skyrocketed after Gulf Coast refineries shut down in preparation for Hurricane Ike. One regional chain urged patrons to limit themselves to 10 gallons and officials in some states tried to head off a run on gas by threatening to prosecute stations that gouge consumers.”We are encouraging motorists to exercise some restraint this weekend,” said AAA Carolinas spokeswoman Carol Gifford. “The run on gas is creating a crisis before there is a crisis.”