2004 Prius: My Ongoing Maintenance Costs

I think most Prius owners find that Prius upkeep is remarkably inexpensive, but there is nothing like a picture
I have included all costs over the 6.5 years and 122k miles of ownership thus far, from wiper refills to tyres. I have excluded a coolant exchange and removal of a spark plug fragment that were both due to my stupidity. Repair costs thus far are zero.

The spikes in cost are tyres. Note a few things:
1. This graphic shows the average cost per month as time progresses; it is not the amount spent each month.
2. In terms of total travel so far, this works out quite closely to one US penny a mile.
3. This is my DIY costs.
4. As of 3/2011 tyres have about 50% wear, and the extensive 120k maintenance is complete.
5. The first set of tyre costs were retrospectively discounted for warranty of premature wear.
6. Of the ~ $1250 spent through 3/2011, $550 was tyres and $108 was for a pump recall I could have let Toyota pay through a dealership repair.

 

Hal,
I don't know if Canada has something similar --
I am notified by email when a store has oil on sale from a 'deals' website called fatwallet.com that is US centric. I stock up for a couple years at a time, and usually end up spending USD $2-3 quart for ACEA A1/A5 synthetic. Years ago I bought a box of OEM oil filters and washers online at the same time I bought the parts needed for the 120k maintenance extravaganza.

Since the Prius and I are in a competition to see who dies last, I am comfortable buying quantity or for use years in the future.