You and I both know that's the severe duty o.c.i. / chart. How many Mirages are going to be doing severe duty? Not many. Very few. 1% or something.
I don't care if the engine holds a half quart. If I'm running synthetic and the engineers say it can go 10k mile o.c.i.'s, I trust them explicitly. I've done that job, I worked side by side with engineers covering every part and system of Toyota & Hyundai vehicles. If the engineers recommend a 10k mile o.c.i., it is because they have done a ****ton of research and testing (or they say to because that's what Toyota's engineers recommend). Been there done that. I'm fine with the standard duty maintenance intervals.