Tundra models equipped with the 4.0-liter engine will have city/highway fuel economy ratings of 17/20 mpg. Tundra 4x2 and 4x4 models equipped with the 4.7-liter engine will both have city/highway fuel economy ratings of 15/18 mpg.

Both the V6 and the i-Force 4.7 V8 feature DOHC 4-valve cylinder heads and Variable Valve Timing with intelligence (VVT-i) for responsive power across the engine's operating range. Both engines are teamed exclusively with a five-speed automatic transmission that offers greater flexibility than competitors' four-speed automatics.

Updated flex lock-up torque converter control enhances transmission response and efficiency. For added driver control, the Tundra five-speed automatic features uphill / downhill shift logic. All Tundra models feature sequential shift as standard equipment.


i-Force 5.7 - A Force to be Reckoned With

Toyota Tundra's trump card under the hood is an all-new 5.7-liter i-Force V8 that is available in every model configuration. 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 DOHC 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.

On all Tundra engines, the Acoustic Control Induction System (ACIS) uses butterfly valves inside intake manifold to switch the length of the intake tract in two stages, based on rpm and throttle angle, to improve torque across the engine speed range. Tubular stainless steel headers flow into a full stainless steel exhaust system with laser-welded, high-capacity mufflers for optimal efficiency and a commanding, powerful sound.

The i-Force 5.7 and 4.7 share a crank-hold electronic starter control that uses a "twist and release" ignition switch. The ECM controls the starter relay to prevent failed starts and "grinding" on a re-start attempt. Both the 5.7- and 4.7-liter Tundra engines meet the Ultra-Low Emissions Vehicle, or ULEV II, emissions certification.

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.

Next year, select 2009 Tundra models equipped with the 5.7-liter V8 will offer flexible fuel capability with E85 ethanol.


Chassis Built for Capability, Control and Ride Quality

The 2007 Tundra is built on a new frame that is optimized for vigorous work duty, impact safety, and ride quality.

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