I just returned a M3LR at AUS with 88% charge and they tried to bill me 25 USD charge fee. When I asked what exactly the policy was the agent told me I had to return within 5% of the charge when I left. Somehow taking out a car with 92% and returning with 88% is not within policy...
They removed the fee after some arguing.
So 5% it is according to Hertz in AUS. Anyone else had the 5% margin at another Hertz location?