Pre-purchase Miles For GM

Does anyone know the approx cost per mile over 15k when pre-paying for miles from GM?
Can i pre-pay with GM? I cant find anything on their website.
I’m looking to get 20-25k per year on a Silverado or Sierra.

.20/mi for prepaid miles across the board for GM. Not worth leasing a GM product above 15k/yr.

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I would buy unless you are writing it off as a business expense, you will go over warranty miles in a year and a half so you’re gonna need an extended warranty.