General Motors has released fuel economy numbers for its all-new 4.3 liter V6 engine (production code LV3) that will serve as the standard engine in the K2XX-based 2014 Silverado and 2014 Sierra. Part of the new EcoTec3 engine family, the new six-banger is rated at 18 MPG city/24 MPG highway in 2WD applications, and 17/22 in a 4WD applications. Making 285 horsepower and 305 lb-ft of torque, the LV3 allows the 2014 Silverado and Sierra to achieve the highest-available payload rating in the segment of 2,108 pounds while being capable of towing up to 7,200 pounds.
The 18/24 MPG rating bests that of the Ford F-150′s 3.7 liter V6, which is rated at 17/23, but falls short of the highway rating of the 3.6 liter V6 in the RAM 1500, which gets 17/25 thanks to a new 8-speed automatic transmission.
Although not officially confirmed, the 2015 Silverado and Sierra are also expected to receive 8-speed gearboxes over the next year.
Source: GM Authority