My husband and I just purchased a 2005 Kia Sportage, pre-owned, with 135k miles, due to our limited budget. The Carfax didn't list any maintenance, and the test-drive and subsequent independent pre-purchase inspection confirmed that there were problems. The timing belt system had not been replaced at 100k miles, the battery was original (and died right after purchase), and the A/C was non-functional. We were able to knock off a lot from the price due to all the work that needed to be done (most of it simply maintenance that was put off, not true issues). A/C problem due to climate control module and is being replaced. Hoping we don't regret this purchase.
Digital MPG shows it averages about as well as the RAV4 (around 23 mpg), though it is not as maneuverable. Love all the extra space and cargo room. Leather/vinyl seats great for easy cleanup from our baby.
Highly recommend an independent pre-purchase inspection before buying used, along with checking the Carfax. I've since heard through friends of others having problems with the climate control module failing.