2004 Toyota Prius Owners Manual - Page 323

Fuel Fuel type: Unleaded gasoline, Octane Rating 87 (Research Octane Number 91) or higher Fuel tank capacity, L (gal., lmp. gal.): 45 (11.9, 9.9) Hybrid vehicle battery Type: Voltage: Capacity: Quantity: Nickel−Metal hydride battery 7.2 V 6.5 Ah (3HR) 28 201.6 V Service specifications ENGINE Valve clearance (engine cold), mm (in.): Intake 0.17-0.23 (0.007-0.009) Exhaust 0.27-0.33 (0.011-0.013) Spark plug type: DENSO SK16R11 NGK IFR5A11 Spark plug gap, mm (in.): 1.1 (0.043) Overall voltage: 311