Gas tanks have been in the same spot in crown vics since the 80's. It doesn't look like they just explode, more like punctured then dumps a ton oh fuel which causes a fire and quickly. https://alexanderlaw.com/blog/2016/0...oln-town-cars/
So run into the back of a 92-01 ford, lincoln or merc that's stopped while doing 60mph and it'll probably burn. I'd still probably rather be rear ended in one of those than a Mirage.