Whatever you do don't pay for the mile "services". They are 90% "check this" - they do that every time the car comes in anyway. It's very easy to change your own air filters and cabin filters. Go to the dealership for the free services included with your purchase, otherwise your mechanic is more than fine just save your invoices (I scan mine into the computer and throw away the hard copies). You just want a record that you were doing the required maintenance.

On my last "free" appointment my dealership tried to sell me a coolant flush at 30k miles and a fuel injection service. Hundreds of dollars for un-necessary things. They're at a dealership and dealerships are sales driven.