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Specifically designed for full-size pickup applications, the i-Force 5.7 uses a long-stroke configuration (stroke dimension of 4.02 in. is more than the bore width of 3.70 in.). As a result, in addition to its impressive 381 horsepower at 5,600 rpm, the i-Force 5.7 unleashes 401 lb.-ft of peak torque at 3,600 rpm.

Tundra 4x2 and 4x4 models equipped with the 5.7-liter engine will have city/highway fuel economy ratings of 16/20 mpg and 14/18 mpg, respectively.

The i-Force 5.7 V8 uses aluminum for the cylinder block and double overhead cam heads. This engine's more advanced Dual VVT-i controls valve timing and overlap on both the intake and exhaust valves, which also helps optimize power, fuel efficiency and emissions.

The i-Force 5.7 is teamed exclusively with a new six-speed automatic transmission, which is only slightly larger than the five-speed automatic. Shift logic adapts the transmission's shift maps to driver input.

Both Tundra transmissions use new Toyota "WS" (world-standard) fluid with a flat viscosity/temperature curve (cold viscosity is close to warm viscosity). This fluid reduces friction and wear, enables faster vehicle warm-up, and never needs to be replaced.

As referenced here Toyota Tundra struts its stuff as new fullsize truck line