It varies, depending on the mileage we're running up. When we bought a home after being long-time renters (while still working), we found in our city we needed a second car. There were just too many times when DH and I were going in separate directions. Public transportation is available but slow to most places.
We usually keep a car to at least 100K or more. Today's cars are very well built and have much better safety equipment. I can attest that stability control, ABS braking, and airbags are A MUST for us, based on our experiences.
Now that we're retired, we run the car often but usually shorter trips (anything under 75 miles RT is considered "nothing" in California, LOL). But when we travel we prefer driving trips, so we rack up 400-1000 miles on a single trip.
Our SUV is a 2003 Hyundai Santa Fe, V6. GREAT car, thousands under the Hondas/Acuras we drove before, just as good if not better. Extremely happy with it. This is what we take on our travels.
Have a 2010 Ford Fusion sedan, V6. Good car, lots of HP but lousy auto trans gearing. Still, it moves when I stomp on the accelerator, which I do quite a bit [smile]. Not an Accord beater, though; ergonomics are poor, controls were designed by an engineering/design sadist. It comes sooo close, and there are features I love about it, but overall I liked my old '85 Taurus better.
The Hyundai has about 79K miles on it and the Fusion 39K. However, I would like to have a luxury SUV or crossover. I want a quieter, more comfortable ride for very long trips. I figure this will be the last new car we buy. Up 'til now we couldn't afford the cars I really wanted.
Now we're finally able to afford one. So it's a matter of figuring out what I want to buy (DH lets me make all the car decisions; he doesn't care about autos). I've narrowed it down to five models just based on specs and on-line reviews. In another month I'll start doing test drives to compare them.
One issue I have is the SUV which appears best is noticeably wider (but not longer) than what we have now. We will be going down to this one car, and many places we go have very tight parking slots. I need to decide how big an issue this is going to be. We live in a crowded urban area and it's a real consideration when driving anything bigger than a Prius -- and this is MUCH bigger than a Prius!
Our current two cars are paid for, and we'll be giving them to friends who could really use a good used car. We keep our cars in top mechanical condition, always.