WASHINGTON—Washington, D.C., was running out of gasoline on Friday, even as the country’s largest fuel pipeline network ramped up deliveries following a cyberattack and officials assured motorists that supplies would return to normal soon. The six-day Colonial Pipeline shutdown was the most disruptive cyberattack on record. Widespread panic buying continued two days after the pipeline network restarted, leaving filling stations across the U.S. Southeast out of gas. With more Americans taking road trips as pandemic restrictions ease, pump prices are at their highest in years. The average national gasoline price has climbed to almost $3.04, the most expensive since October 2014, the American Automobile Association said. As politicians discussed legislation to improve cyber defenses, more gasoline stations shut down in the capital city of the world’s largest oil-consuming nation. On Friday gas station outages in Washington climbed to 88 percent from 79 percent the day before, tracking firm GasBuddy said. …