And that's with a carburetor and three-speed non OD transmission!
Swap in a TBI unit and a modern 4-speed OD transmission and I bet it would get 30 mpg on the highway.
As far as being in an accident: I would bet the Caprice is more crashworthy than a current compact car, despite not having air bags, etc.
It would definitely handle a minor fender-bender far better, in terms of physical damage to the car itself.