My first set of Seicento pads lasted 36,000 miles from new, they were changed at the 36,000 mile service by a Fiat dealer and the replacement set were down to 2mm by the 48,000 mile service..... I had made no change to driving style and the discs were fine. Fiat weren't the slightest bit interested in the lousy 12,000 mile pad life, so I put EBC pads in which then lasted about 36,000 miles again. However, if yours really are through in such a short space of time, you've probably got a seriously sticky caliper - or the problem goodeye mentioned - the amount of c**p that can come out of the rear drums is mind boggling....