user: Question: Who led the most laps when Brandon Wagner had the fastest lap?
Columns: ['Rd.', 'Race', 'Pole position', 'Fastest lap', 'Most laps led', 'Winning driver', 'Winning team']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'St. Petersburg', 'Esteban Guerrieri', 'Conor Daly', 'Josef Newgarden', 'Josef Newgarden', 'Sam Schmidt Motorsports']
SQL:

assistant: SELECT "Most laps led" FROM "Table" WHERE "Fastest lap" = 'Brandon Wagner';