After clicking 'End Trip' you will be prompted to record the fuel level again. Please make sure the fuel level is at the level it was when you picked up the car or you will be charged for the cost of gas at a per-market rate, between $5.99 and $7.99 for regular fuel and $6.49 and $8.49 for premium fuel.
After the fuel level is recorded you will a see list of important steps to take before you end your trip, specific to that car. Check the boxes as you go through the steps and don't forget to grab all your belongings!
Once you have completed all the tasks and checked the boxes click "Lock & End Trip" which will issue the locking command to the car and end your trip.