2003 Toyota Prius Owners Manual - Page 95

44.Fuel gauge Depending on the ambient temperature, the fuel quantity is less than 45 L (11.9 gal., 9.9 lmp. gal.) even at "F". However, this does not affect the fuel consumption and the remaining fuel ratio indicated on the gauge. (For details, see "Fuel" on page 148 in Section 3.) Low fuel level indicator light 24p001a 24p002a Blink The gauge indicates the approximate quantity of fuel remaining in the tank when the ignition switch is on. Nearly full-Indicator at "F" Nearly empty-Indicator at "E" It is a good idea to keep the tank over 1/4 full. When you refuel on the slope, the indicator may not show the correct level. When you refuel less than about 11.4 L (3.0 gal., 2.5 lmp. gal.), the fuel indicator may not change. After the auxiliary battery is reconnected, one segment will flash for a while. If the fuel level approaches "E" or the low fuel level indicator light blinks, fill the fuel tank as soon as possible. 88