I tried to get more highway data last night but the weather was not cooperating with wind at 10-20 mph from the side. No traffic, but it was tossing me around enough that I gave up on it for better conditions.
I am really looking to confirm if the spacers make that much of a difference as I know that many i3 owners install them. We should at least be aware of what effect they have on range.
It's a bit frustrating to put testing other things on hold because of it, but I can at least say that in crosswinds it makes zero difference.
I will probably have to plan a much longer trip to get good repeatable data either way.