I'm installing a 3' vinyl fence. Can I cut post covers in half to save money?

The fence is a 3' picket fence. Vinly post covers are fairly expensive and come in 100" sections. Since only 4' of the post is above ground, can I cut the post covers in half and have the wooden post go deeper then the vinyl covering? I'm planning on setting the posts in concrete with gravel at the bottom.

Answers:
you can, but it might look kind of cheesy, also, the vinyl wont be protecting the whole thing

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