Three million miles, or 4.82 million kilometers in case you live in the metric part of the world. That's more than six times to the Moon and back. Quite a lot to ask from a car, isn't it?
Of course, it's likely that no new car will do what Irv's Volvo P1800S has done. With all the electronics generating random errors and the way too expensive replacement parts which that be only accessed by special tools we expect new cars will end up in a junk yard faster than you can blink twice.