I'm sorry, there's no way you'd be able to tell the difference between, say, a 320kbps Ogg Vorbis and a FLAC. Humans don't have hearing that good, and even if they did, there's so much distortion added by amplifiers and speakers and imperfect listening environments that even sitting still it's all in the noise. While driving, that's total bullshit. Volvo C30s aren't *that* quiet, no car is that quiet, but C30s especially aren't that quiet. My wife has an S40 which is the same platform and interior, and it's not all that quiet compared to the newest cars (and it likely has a softer suspension and less-sticky tires than your C30, making for a bit less road noise). You want to try a quiet car? Go test-drive a Tesla. The lack of engine noise makes a huge difference. But even there the tire noise is very significant.
As for the option being removed, I'm not really sure; probably some software engineer wrote directly to requirements and the requirements didn't specify .wav. They probably didn't think anyone used that crappy format any more anyway. Does the new models support FLAC? It's utterly stupid to use WAV any more now that FLAC is here, and it's been that way for at least a decade.
Also, if you really think your ears are that good and that you can hear artifacts, try compressing the same song in both 320k MP3 and Ogg, and compare. Get a friend to do a blind trial too. I wouldn't think you'd be able to tell a difference at that bitrate, but at lower bitrates, MP3 is infamous for having pretty bad distortion at high frequencies (IIRC), usually making cymbal crashes sound wrong, while Ogg Vorbis is well-known for being much better at the same bitrates. For kicks, try out the new Opus codec too (it's also used with the Ogg container, but files are normally called .opus to differentiate them from Vorbis audio files). Opus is by the same people who did Vorbis, but is supposedly a significant improvement.