August 28th, 2008 at 4:42pm
Listen to this story:
To try and protect its market share in the full-size pickup segment, GM’s coming out with what it’s calling XFE models, which stands for extra fuel economy. The Chevy Silverado and GMC Sierra XFE models are two-wheel-drive-only, equipped with a 5.3-liter V8 that’s mated to a six-speed transmission and can also run on E85.
To improve aerodynamics GM engineers added a tonneau cover on the bed, extended the front air dam, lowered the suspension and revised the chassis tuning. To cut weight they added aluminum wheels and lower control arms.
Even so, all that only improved fuel economy by one mile per gallon, and it shows just how hard it is to tweak a truck to get better gas mileage.