Fortunately my region does not often require a valet as there is typically lots of parking options. I will typically drop the beautiful one off and then go park in a regular spot. If forced I will ask to park it myself and tip as usual. I cannot imagine writing the guys name down or writing the mileage on a post it note haha Sounds like you are asking him to take a leak in your gas tank Then again, if you have to do it regularly this sort of system must provide some comfort.