My farm truck (1997 Ford F250) has about 280K on it, my daughters winter vehicle (1997 Suzuki Sidekick) has about 275,000. We just replaced my wifes winter vehicle (96 Blazer) when it was 270K with a 2008 Saturn Vue. I just do the math, when it costs me a enough durring a year to make a small car payment, then it is time to get rid of it. If it is more than 2400 for the year to do the maintenance, time to go. The suzuki cost this last year 2300, Engine rebuild, tires, brakes, starter. I also look at the condition of the vehicle, We bought it for 4000 and will hopefully sell it for around 2000 or 3000. These vehicles have no value other than a form of transportation, so no emotional value.
Just for Info: Wife drives a 2009 Mini Cooper Convertible, traded in her 2003 Mini cooper S. Daughter drives a 2009 Mini Cooper Clubman, JCW, traded in her 2003 Mini cooper S.
I drive the Farm truck,I cant afford anything nice for me, but it is comfortable and the girls are happy.