Watching the ring video, 2 seconds tick by between passing the camera & the loud crashing sound. If this was the 7th house from the stop sign, and the yards appear to be about 50 feet wide, and crossing thru the intersection thru the yard (IMO completely airborn, judging from plants don't appear to be broken or uprooted), that's approximately 400 ft in 2 seconds, IMO.
SO, I would have say the mini Cooper Clubman was going as fast as it could possibly go, much faster than 90mph, IMO.
Also looking at photos from the tennant's, LM, fundraiser page, the mini went thru the front exterior wall of the house, a room full of furniture, shoes & clothes, an interior wall of the house & finally coming to a stop crashing almost all the way thru the side wall. IMO this was no accident.
JMHHO