 Complete the following phrase:  Fabi drove for Benetton Formula in the No. 19 Benetton B186-BMW M12 after Toleman were fully taken over before the 1986 season to become Benetton, with powerful  qualifying engines, and talented young Austrian Gerhard Berger joining. The Benetton was fast but fragile with difficult Pirelli tyres and Fabi often qualified better than he raced. He managed pole position at the 