The Longest I've Kept a car is 8.5 years on my 2000 Hyundai Sonata. in that time i took it from 16k mi to 105k mi.
Replaced that in Feb 2010 with the Neon(2005 SXT, My Brother was the Original owner, he drove it from 44mi to 54k mi, I took it from 54k-84k mi) ,which i replaced this past Jan with my Sable.
My Parents Bought Mom's 99 Taurus new in fall 98. it was her DD until sold in Feb '12, with 124k mi.(During which time dad went through 4 cars, he seems to get the "bug" every 3-5 yrs, or when the car nears 100k mi)
My Uncle Bought his 95 Bonneville SSEI new, put 300k mi on it before he cash-for clunker'd it (summer 2009)
My Brother has a 98 Mustang GT he bought new, as of last fall it had 14,500 mi on it. (lots of garage sitting...5 speed in Dallas rush hour = no bueno) now he has started building it up for a "fun"/track day car.
My Aunt has a Mid 90's Grand Prix they bought used around 97.
has around 200k mi. still runs like a champ. her hubby (My dad's Twin) has had...at least 3 different cars in that time.