NEW YORK, Aug 21 (Reuters) - Chicago cash gasoline traded at1.00 cent above U.S. RBOB gasoline futures on Friday, a24-cent weaker differential from Thursday, according to traders,slumping on news of an earlier-than-expected return of a crudeunit at BP Plc's Whiting, Indiana, refinery.
The neighboring Group Three market had gasoline offered bysellers at 4.00 cents above futures, off from its Thursday pegat 10 cents above the benchmark.
BP's Whiting, Indiana, refinery may restart a keycrude oil unit weeks earlier than expected, according to sourcesand a published report late on Thursday. (Reporting by Robert Gibbons; Editing by Bernadette Baum)