If you try to exit immediately after the burn, there will be delays before you get to pavement. Gate says that exit traffic usually lightens about 2 AM after the burn. That would mean less waiting time before you get to pavement, but you still may arrive later at your destination than if you had lef...

You'll definitely get a net heat increase inside your tent. I'd suggest putting the fridge in a separate little tent.

You're not the only one with the idea of leaving right after the burn, so, yes, there will be traffic. Gate crew suggests waiting until 2 AM after the burn. http://gate.burningman.com/faq-gate.php

Are you leaving on the 3rd or the day before the man burns? The day before the man burns is the 1st. The only limiting factor on leaving that day is the speed limit, so that means, what, 45 minutes to pavement if you really restrict your speed.

I have seen that the area between about 2:30 and 4:00 on the outer 2 or 3 roads is very slow to fill up. I camp near there and often refer late, wandering RVers to that area.