No, it's not been the same one twice. It's pretty much just a friction fit, and once the radiator warms up, it may cause the material to soften. Leading me to some form of attachment, hot melt, monofilament, etc.
But, I was considering leaving out the center one, for aesthetic reasons.
I don't have enough data to indicate whether leaving one out is relevant or not; nor do I know how much impact it will have overall - can I get .5+ MPG out of it?
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