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I think a mid mounted spoiler looks like the only way to reduce the grime that gets onto the rear window, without increasing drag.

Playing with the top spoiler, i.e. getting it to force air down the rear screen (like an air curtain) would probably be quite involved, and might end up reducing range. Going for a mid spoiler to try and separate the road spray from roof spray, might be easier.
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I've seen this design posted elsewhere on this forum, but does anyone know if it's been tested in the rain?
 

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There's a guy that mounted a spoiler on a Golf to go on the Nurburgring, and the explanation was that it kept the underbody air coming too far up the hatch. In his case it made the car unstable at high speeds (lifting the back up), in this case it keeps the air coming over the top attached to the rear window, similar to a sedan. Look at all the new sedans and Teslas, they all have a hard inverse chine at the rear tailgate to induce this effect.
 
mid mounted spoiler is the way to go. Look at the new MG4 design at 12:40, driving in the rain with no dirt on the rear window!
Even though I really like the new MG4, I dont think you can use that clip for evidence of a dirt free rear screen, it was covered in raindrops & would probably be just as filthy as the I5's screen after driving for a few hours around country lanes
 
I think a mid mounted spoiler looks like the only way to reduce the grime that gets onto the rear window, without increasing drag.

Playing with the top spoiler, i.e. getting it to force air down the rear screen (like an air curtain) would probably be quite involved, and might end up reducing range. Going for a mid spoiler to try and separate the road spray from roof spray, might be easier.
View attachment 45562
I've seen this design posted elsewhere on this forum, but does anyone know if it's been tested in the rain?
I like this idea, a mid mounted spoiler below the rear window, a lot. I think it would be the most effective.
 
Ioniq 5 already has a pretty poor efficiency thx to considerable drag coeff - this is hugely improved on the Ioniq 6 btw.
Likely you'll simply increase the Cd & reduce the range even further.

My Ioniq 38 is managing 210 miles easily at present height of summer, Ioniq 5 with 73 kWh should be around 400 miles but in practice nowhere near. I'm expecting Ioniq 6 with 77 kWh battery to do 400 miles, as CD 0.21 is even lower than mine of about 0.24!

How about looking at some of the clever things in Ioniq 6, like the drag-reduction under front wheel by reducing some air gap somewhere etc?
400 miles was never the range of the 73 kWh Ioniq 5, 300miles is the stated range for that car going up to 315 for the bigger 77kwh battery version

The drag coeff of 0.288 on the ioniq 5 is a trade-off to give good rear headroom, good boot height and boot capacity, i.e function over form one could say. It's significantly better than similar sized SUV's which often have drag coeff of 0.35 or more.

When the ioniq 6 reviews come out I'm 100% certain reviewers will be giving out about rear head room and constrained boot space, but it will no doubt give very good range with current info placing it at around 379 miles (not breaking that 400 miles expectation you have). The cavernous rear of the Ioniq 5 has been likened to a limo, I can't see the Ioniq 6 getting similar comments.

So if you are willing to trade rear headroom, boot height and boot capacity you will get about 60miles extra range. Personally, I wouldn't be keen to switch to an ioniq 6 just to get a 60miles extra range as I need the boot space the Ioniq 5 offers and when I carry passengers, they are generally adults, so I'd like them to have comfort in the rear seats.
 
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