The product team has confirmed the following:
If you need to select an annual allowable kms of: 12,000 - please select 16,000 kms from the drop-down in the HUB: the rate is the same, and the 16,000 does not appear anywhere in the contract (it's a current HUB limitation).  

Our EWU contract is a waiver of excess charges associated with the lease. If the lease specifies allowable kms = 12,000/year then that is what is actually covered.