2012 Toyota 4Runner Owners Manual - Page 932

6-1. Specifications Engine Model Type Bore and stroke Displacement Valve clearance (engine cold) Drive belt tension 1GR-FE 6-cylinder V type, 4-cycle, gasoline 3.70 × 3.74 in. (94.0 × 95.0 mm) 241.4 cu.in. (3956 cm3) Automatic adjustment Automatic adjustment Fuel Fuel type Octane rating Fuel tank capacity (Reference) Unleaded gasoline only 87 (Research octane number 91) or higher 23.0 gal. (87.0 L, 19.1 Imp. gal.) 636 4RUNNER_U