
Engineers spent a lot of time in the wind tunnel eliminating turbulence. There are new mirrors, triple-sealed inlaid doors, as well as roof, cab, bed and tailgate tweaks, to name only a few, that all help air flow smoothly and quietly.
The new EcoTech3 V6 engine used in 2014 Chevrolet Silverado and GMC Sierra full-size pickup trucks is EPA rated at 22 mpg highway for 4×4 versions and 24 mpg for 2wd. This means the 4.3-liter V6 is competitive with – or better than V6 engines – used in the Ram, Ford F-150 and Toyota Tundra pickup trucks. GM’s 2wd V6 Sierra models match Ram HFE’s 18 mpg city, which has the advantage of an 8-speed automatic transmission compared to GM’s 6-speed; while 4×4 models are rated at 17 mpg city, the best of any full-size pickup. The engine runs on 87-octane regular grade gasoline.
The combination of three technologies in the so-called EcoTec3 – direct fuel injection, variable valve timing and cylinder deactivation – also allows for a class-leading payload rating of 2,108 pounds and the highest optional towing rating of 7,200 pounds. The engine uses a compact overhead valve design – yes pushrods – and weight-saving components such as aluminum block and cylinder heads to reduce the mass for additional energy savings. Continue reading



