Contributing to this development is a new fuel saver mode which enables the trucks to make better use of GM's Active Fuel Management system, running on four-cylinders in light throttle conditions instead of eight. In addition, more efficient six-speed transmission shift points, engine variable valve timing and a lower gear ratio of 3.08 (now standard on GM full-size pickups) each play an important role in the improved fuel economy.
This fuel economy improvement comes with no compromise in capability. Horsepower, payload, and trailering specifications remain the same for Chevy and GMC full-size pickups.
For reference, the following information is the most recent available EPA-estimated comparable fuel economy data for GM's main competitors in this segment.
Ford - 5.4L: 14 city / 20 hwy; 4.6L with 6-speed transmission: 15 city / 21 hwy
Dodge - 5.7L: 14 city / 20 hwy
Toyota - 5.7L: 14 city / 18 hwy; 4.6L: 15 city / 20 hwy
Nissan - 5.6L: 13 city / 17 hwy; 5.6L (E85): 13 city / 18 hwy