Well on my clunker including buying it over the last 6 years I've spent $1016.67 a year for everything other then gas. Don't have a clue how much I've spent on that. I've rebuilt pretty much everything under the hood including the engine and trans. You can add another $1 to the average since my windshield wiper linkages just died on me which will cost me another $6 for new bushings.
89 dodge caravan turbo fairly modified which is the cause for a lot of the $$$ on my average

.
My miata turbo I've only had a year so its average is pretty high since I paid cash. Its around $5k for now.