Just finished passing the 24,000 mile mark on the FIT. Bought it new at the end of April 2006. It's the base model, 5-MT. This is my first Honda and the first auto I've ever owned that had a service reminder setup that shows you what to do via the dashboard idiot lights. So, I've been doing the oil changes at 6,500 mile increments on average per the reminder. I've changed the oil filter and rotated the tires at the service mark as well.
This go around I needed to change out the pollen filter and the air filter as well. So, I did those two items as well and all is well. I noticed an imediate fresh smell from the A/C thanks to the new filter so that was a nice surprise.
The FIT continues to run fine. I'm averaging around 40mpg still on mostly 2-lane and 4-lane highways commuting to work. This was the reason I bought the thing to begin with and so far it has not disapointed. Next up are windshield wiper blades in the fall. I had intended to do that this summer but we're in drought here in the mid-Atlantic so no need at the moment -- they've hardly been on at all.