Hi Justin,
I am also on the CC and have an 05 6MPS. Similar to you I only do ~20,000km/y which is >50% freeway driving to Sydney, now a total of 98,000km. I have had the car since new. Apart from an initial clutch replacement by Mazda to improve driveability I have never had a single problem. In the past 12 months I have done some performance mods (dp, SRI, Ecutek tune, short shift plate). These mods dont put much extra strain on the engine and I think are well within its design specifications.
I am about to change the front discs + pads for the first time and the back has more to go before replacing so very happy with that. I intend to have the car for another 5 years if no similar/better car is released by another reputable manufacturer - I'm still waiting. I guess I might have to look at the turbo seals or clutch during the next 100,000km but with my low-stress driving maybe everything will hold together well. I do enjoy pushing the engine in first and second as appart from track work there is limited opportunity to really enjoy the performance of this car on public roads.
So to answer your question, I am just expecting regular maintenance costs as per regular 6 monthly services at Central Coast Mazda, who do quite a good job.
Last edited by Scienceman; 15-06-2011 at 11:14 AM.
Cheers,
Scienceman
(rerum novarum cupidus - remain unbiased and curious)