It will probably be "collisions per million miles" or "fatalities per million miles" or something of the sort. Right now those numbers are roughly tabulated by

It will probably be "collisions per million miles" or "fatalities per million miles" or something of the sort. Right now those numbers are roughly tabulated by insurance companies, but they're not really published as part of the boilerplate posted on the car where miles-per-gallon are often shown. If people knew they were buying a death trap they'd probably give it some sober second thought.