Definitely not fuel exhaustion. If you slow the raw footage down you can see a decent amount of fuel rupture out of the left wing tank over the car windshield and also from the right tank onto the concrete at impact. Incredible that there was no fire. You can also see the ballistic airframe parachute launch after the initial impact.
Warning, this footage not for the squeamish.....
Surveillance camera captured plane crashing into car | khou.com
Recording of the ATC audio. What a complete mess.....
https://youtu.be/J6dC8t_7KsA
Modern Cirrus' have a form of envelope protection which makes it quite an achievement to ignore the slow airspeed warnings. On pure speculation it would appear the busy terminal environment conspired to bring an inexperienced pilot unstuck. My thoughts with the victims and their families