Hi I drive an RX8 so I think I'm more qualified to give an accurate account about owning and maintaining an RX8. 1st hand experience is more accurate than "hear-say"
I don't know what criterion your sister looks for in a car, surely cannot be good looks becos if based on looks, Altezza has none, plus it looks outdated.
Ok as for maintenance, fuel consumption is high if u would compare to altis, vios, city, kancil, viva and so on... but it is rather reasonable if u compare to evo, sti, civic fd 2.0, skyline, caldina etc... What I mean is, u cant compare a cyclist and a weight lifter just becos both are humans.
As for the engine oil, it is not to say u have to top up every week, depends what oil u use, some oil dosnt burn as easily, like i only have to top up about 1ce every month.
There are many myths out there...
out of 100 ppl who gives their opinion on rx8,
80 dont even own an rx8
and base their facts on "hear-say"
and some based on the hear-say about rx7s
20 others are owners
but out of those 20 ppl,
only about 10 rx8ers I would say actually knows about their cars
the other 10 rx8ers ppl are sort of dunggu-dunggu types
just follow what ppl tell them without self investigating
and these ppl usually are automatic rx8 drivers,
know how to drive, dono how to maintain a car.
so if u ask any of the 90 people u r likely to be mis-guided
Feel free to ask me more about RX8