That looks real... I'm glad you had your wits about you. It's good notice for the rest of us just in case.
Can you guestimate how much time elapsed from when you saw the fire, how long after that till you were out and then subsequently how much time elapsed after that before the entire vehicle was engulfed?
It must have seemed like forever, but I have never had anything like this happen and was wondering how quickly the situation can develop.
I can't tell you the exact timing. What I can tell you is this.
I noticed small flames though my back window (it appeared to me they were dancing on the bottom edge of the back glass). I'd guess it took me 1-2 seconds to get my thoughts in line and take action. It was rather shocking to see fire behind me. Not something I was expecting.
I engaged the brakes, I checked my mirrors, no other cars around, applied brakes harder and pulled over (see notes above re: e-brake & harness). Noticing the upcoming grass/etc on the side of the road, I made sure to stop on the bridge, and not fully over the shoulder (not create a brush fire)
Jumped out, and ran. I spent zero time in the car organizing stuff. Once I was stopped, I was out and running. As I passed the front bumper I heard the fire rapidly engulf the rear of the car.
I ran quite far away, and then turned to see the car engulfed.
If I were to guestimate, from the time I noticed the flames, to the time it had engulfed the car, and keeping in mind, it's entirely a guess, around 10 seconds? Under half a minute for sure.
~2 seconds to react
2-4 seconds to stop the car (she had very nice brakes & tires)
3-5 seconds to get out and start running
Actually, looking at that, I'd say definitely the 8-10 second range.