Sedan drag reduction with special spoiler

[Frank Lee]

I don't think those meet the criteria for VG spoilers as defined above.

Height supposedly is optimal at about 1/3 the way up from trunk to roofline.

These GMs appear to be about 1/10 the way up and besides, their trunklids are so high they practically don't need spoilers at all. I have my doubts about a feature that small being able to produce counter-rotating vortices big enough to cancel out the ones coming off the C-pillars.

I think they fall into the category of styling feature.