I bought my RCZ as a demo in 2012 with 120km on the clock. 18km of those was on my test drive. It now has 112xxxks on it. Servicing from Peugeot is expensive. But as they are now out of warranty, you can take it some place good for a better price.
In the time I have had mine, I have had, 2 front high pressure fuel pumps, the fuel rail, and the thermostat replaced under warranty. The thermostat was then bypassed to fix the issue of it failing again. Otherwise that was it for new parts. However, about 2 years later, so now, I am getting fueling issues once more. So it looks like the Front HPFP/Fuel rail need to be changed again, possibly the rear fuel pump. Been quoted;
Front fuel pump: $ 1465.07
Rear fuel pump: $ 745.04
Fuel Rail: $ 572
From Peugeot.
EAI was $800 OEM or $1200+ for genuine. And did not get other prices as that is all they gave me when I called.
The tyres that are on the car are a weird sizing, you don't get a lot of choice if you stay stock, and the choice you have is expensive. I went the next size up and saved $400. However at full lock at slow speeds there is a slipping and banging from the tyres which gets annoying.
The engine does tend to use some oil. After 10,000ks it will be down a bit. So I do oil changes every 5,000ks now.
Around town I can get around 700km to a tank. So about 650ks before refueling. If I do a Canberra to Syndey trip I can get there and back without refueling. I use it to go to the snow quite often, and with the back seat dropped I can fit in a 181CM snowboard and a set of 175cms skis and all gear with plenty of room left over. It can happily transport a bicycle.
I find it a comfortable car to drive as it has quite a lot of adjustment in the seat and steering wheel. The visibility is good, once you learn to look through the tiny side windows, and where to place the car for corners. It is wide and you sit in a little bit. My elbow sits on the window ledge, so for car parks you have to get close to ticket machine, or else do the door open.
But in my 112xxxks and 6 years of owning it, I have loved it. It has only had an issue once when I needed it (was waiting for the HPFP to come in and be replaced under warranty). I have had it at a track day with a bunch of RX-8's which was very fun. Not found a better car to replace it with. Looking at keeping it for as long as it keeps going. All my friends rag me for owning a Pug, yet in the pug I can take corners better than a friends well worked STi.
Side note, if you want to Mod it, there is not a great deal of options available for you. But mine is stock (bar the next size up tyre) and is still dang fun.