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mine is brand new MY2023.5, and came with rather chunky 21 inch pirelli AS, which are middling to bad on rolling resistance. i would probably change them out just for ride quality and noise. looking at a few options but the ones that fit this rim are rare. the bridgestone alenza as ultra might be an option but i don't see any rolling resistance figures for these.
The VG is more of a science experiment to have fun with turbulent flow, I agree they are likely useless on the back and top side of this. There's no flow reattach point and the fins are not big enough to energize the entire back area. Although I think putting a few near the mirrors/sides could help to reduce wind noise. I didn't get the model with laminated side windows. I got some sharkfin ones to look cooler.
The rear diffuser area has a gigantic hole for putting on the towing hook which I don't need, so I think sealing that off may help.
The mod I think would really help would be aero wheel covers, like the ones they have with the new volvo evs. EX90 21" 8-Spoke Aero (can't post link yet)
but this thing is even heavier than my current 21 inch rims so idk. it does look nice though. I'm thinking of taping up the wheels to test for potential gain in this area.
The cfd on this car suggests that extending the top spoiler may help a little bit, but i can't see a way of doing this that isn't ugly.
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my23 xc90
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