This one is quite easy just use the Koenigsegg Regera if you have one, or any S2 or X class car which can cross speeds of 200mph and try to have 0 aero like no wings or front splitters. As soon as you jump press and hold the brakes so that the car doesn't roll forward saving you time to go back for another jump. I personally did this with the Regera while hitting a speed of 225mph and a jump record of 730ft.