Longest drive was a 1989 Honda Civic Si, drove that thing from Toronto to Daytona and back when I was in High School.
Otherwise, MacGregor MacTec NVG2 7W. Played Black Diamond in Ontario, one hole had a huge elevation change and ended up ridiculously long. Close to or slightly over 300 yards, which is long if you know me.
TM M2 (2016) if we are talking about the longest "Driver" I have used...