A brake job every 30,000
A brake job every 30,000 miles? It sounds like you rest your foot on the gas pedal. A competent driver in a Ford Fiesta should only need new pads every 50-90,000 miles.
It's interesting that you don't count the cost to replace the Prius batteries in your more complete cost model. How long do they last? I'm guessing between 150,000 and 200,000 miles, which is well below the useful life of a car. This cost will show up as either depreciation or replacement cost for the owner.