I can't speak much for the 2012 as I only have just over 800 miles so far, but I only ever had minimum maintenance on my '03.
Oil changes every 5k-8k, with partial synthetic, then switched to full synthetic at 220,000 mi.
I changed the transmission fluid the first time at 160,000 mi and again at 210,000 mi.
New tires every 60,000 miles or so, I was never good about tire rotation either.
I think I went through 3 sets of brakes, a few tie rods, and a sway bar link.
The only warrantee work I ever had done was replacing a defective radio that suddenly started turning off and on at 1 second intervals, and one of those swap bar chains.
She did start burning out drivers side headlights every 3 months for the last 18 months I had her.
I had to replace the battery & starter in 2010, as well as get a new horn earlier this year.
She got up to 261,503 mi, before I hit the back of a truck, and they only declared her a total because of how much mileage she had on her. The new brakes were only a month old.
I never even got her a tune up and she still drive fine, just needed a new drivers seat but I do that to all my cars. I was still getting 32 mpg as well, but my driving is 90% highway.
If this Focus is half as good as my '03 I will be happy.
That Focus I got of the dealer floor, in 04. She was a year old model who spent that year in the show room as far as I can tell. She only had 8 or so miles on her when I took her off the lot.
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