Lexus IS F 2012 Owner's Manual page 515

Engine
Model
Type
Bore and stroke
Displacement
Drive belt tension
Fuel
Fuel type
Octane rating
Fuel tank capacity
(Reference)
2UR-GSE
8-cylinder V type, 4-cycle, gasoline
3.70 3.52 in. (94.0  89.5 mm)
303.2 cu. in. (4969 cm
Automatic adjustment
Unleaded gasoline only
91 (Research octane number 96) or higher
16. 9 gal. (64 L, 14.0 Imp. gal.)
6-1. Specifications
3
)
6
515