At the store, they mainly tried to sell me insurance, and there was some attitude after I refused. Additionally, they charged me for a full tank of gas at the time of return (even though it was supposed to be returned full) and claimed it was included in the prepaid contract. However, they still directly charged my credit card. In hindsight, I should have refilled it before returning, but the gas cost they charged was as if the tank was completely empty. So, don't believe them if they say gas costs more near the return location.