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If this is something you want to sell to other Vibe owners, I think the effort would be wasted.
If they bought a Vibe, then they were most likely wanting some sort if small SUV ( CUV ? ) like vehicle, and fuel economy would be low on their list of priorities.
If this is for yourself, I still feel the effort would be wasted.
Filling plugs in wheels will not make a big difference in drag. It does have an effect, but on SOME DESIGNS of wheels, the effect is next to nothing, and can be even worse that no gaps at all.
I would test first.
You could close off the gaps using duct tape, ( on both sides of the wheel so it sticks to itself ) and see if you see a difference.
I'm guessing that you will see no change at all, except for a sticky mess.
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