Generally speaking, the number of indicator lights and their corresponding fuel levels can vary between different motorcycle models. To determine how much fuel is left in the tank when the last indicator starts blinking in the FZ V2, it would be best to consult the owner's manual or contact the manufacturer or a Yamaha dealership for the most accurate and up-to-date information. They can provide you with the specific details related to the FZ V2 motorcycle's fuel gauge and indicator system.