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I am skeptical it will make a measureable difference.
Often it does make a difference; too much.

There isn't much, if any, excess capacity in the ICE cooling systems on any modern car these days so.......
You might be just fine as long as running on the battery but might overheat quickly when the ICE cuts on.
 

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I was looking to add a coroplast piece on the air intake and maybe leave 10% open. AND only for winter. Montreal winter!
A little experimentation will be required.
I think 90% coverage might be too much but that's just a wild guess.
Just don't make your first test run or two in a place that it will be hard to stop and "adjust" your baffle.
 

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There is no magic number for aero-effect. Try riding your bicycle 35 MPH.
I ride a motorcycle so I KNOW about wind resistance.

And yes there IS a speed below which the aero drag is not a significant factor.

It varies some by vehicle size and body style and is partly because the air "bunches up" at some points and creates "drag pockets" at others, both of which doesn't happen at lower speeds. At lower speeds, the mass of the vehicle and mechanical friction are bigger factors.

And without putting it in a wind tunnel, you can't be sure if your "fix" makes things better or worse.
 
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