Having recently driven the 2014 GM trucks with the new 6.2-liter L86 EcoTec3 V-8 engine, we came away impressed with the engine's responsiveness and its refinement. Today, there's one other aspect we can be impressed with, fuel economy. GM announced EPA ratings of 15 city, 21 highway mpg for the two-wheel-drive model, and 14 city and 20 highway mpg for the four-wheel-drive model.
This compares favorably with competitors' smaller V-8s, and surpasses several of them. The 6.2 beats the Ford F-150 equipped with the 5.0-liter V-8 and 4WD by 1 mpg each in city and highway ratings, and falls just 1 mpg short in city and highway ratings of the Ram 1500 4x4 with the 5.7-liter Hemi and the TorqueFlite8 eight-speed automatic. It's also significantly more fuel efficient than the Toyota Tundra equipped with the 5.7-liter V-8 which only manages 13 city mpg for both the 2WD and 4WD model, and 17 mpg highway for the 4WD and 18 mpg highway for the 2WD model.
The fuel economy is also just slighty off that of the 5.3-liter V-8, which gets 16 mpg city for both the 2WD and 4WD models, and 22 mpg highway for the 4WD and 23 mpg for the 2WD.
Source: General Motors