I did this shop yesterday and for those thinking of doing it, Hertz adds a $13.99 Express Fuel Fee if you do not provide a fuel receipt at turn in. Apparently, if you drive less than 75 miles, they require a receipt to show a fuel purchase to ensure a full tank. The agent said it could be a receipt for .50, just as long as there is a receipt.
I have emailed my experience to the MSC, so hopefully I get reimbursed for that as well.