Be careful of fuel charges...
We turned our rental with a full tank. I took a photo of the odometer and gas gauge.
The check-in agent completed her walk-around and handed me my receipt. It indicated a $25-ish refueling fee. I stopped her and inquired as to why. She said "Oh, that's odd. I'll have my manager cancel it."
The manager came over about 5 minutes later and handed me a new completed Rental Agreement.
48-hours later and the fuel charge was still on my credit card. I had to contact National through their website to have it removed.