Your car reservation is paid in advance, so you will spend less time at the rental counter and you travel faster! Your credit card is charged at the time of booking and the advance discount is automatically applied to your rate. Option 2: Full return or payment from Alamo for gas This option allows a renter to return the vehicle with a full tank or pay Alamo at the end of the rent for the gas consumed but not replaced. The price per gallon/liter is higher than the local price of fuel. Jennifer, we have taken note of your comments and would like to have the opportunity to review it for you. Please send us a detailed email to Care@Alamo.com the exact rental location, your contact phone number, your complaints, lease or booking numbers and more information about your experience with us. We look forward to hearing from you soon! – Carol H. .