Literally the only thing that I haven't completed. I already bought 3 aftermarket cars trying to complete it, but game refuses to award me this final point. I wouldn't think auction house cars are meant by this, but rather the roadside sale ones?
Imagine being able to, mid auto-drive, switch to drone mode and fly around while the car is driving. Currently, the car just stops when you enter drone mode, and gets back to auto driving as soon as you leave it again. May be a small bit bad for rendering, having to render possibly 2 different location for a single player at the same time, but if that's the issue, a compromise of having a range limit that forces the drone to move along at a specific range could be made.