XFE stands for Xtra Fuel Economy, a new badge worn by four of GM's 2009 trucks and SUVs and two of its 2008 cars.

Every little bit counts, which is why General Motors is applying more fuel-efficient technology to its truck and SUV lineup. The result is one extra mile per gallon squeezed out of four of its thirstiest vehicles.

GM's Xtra Fuel Economy model designation is designed to increase the fuel economy of some of its heaviest drinkers; full-size pickups and SUVs. Two-wheel drive versions of the 2009 Chevrolet Silverado, Chevrolet Tahoe, GMC Sierra, and GMC Yukon equipped with the 5.3-liter V8 and 6-speed automatic transmission will be badged XFE. The 5.3-liter uses GM's Active Fuel Management cylinder deactivation system for further fuel savings. Silverado and Sierra XFE are available only in the crew cab bodystyle.

According to GM, XFE models will get 15/21 city/highway miles per gallon versus the non-XFE rating of 14/20 mpg. XFE vehicles use a combination of mechanical, aerodynamic, and weight-reducing modifications to raise their fuel economy.

Many new-for-XFE features are currently used to make GM's hybrid vehicles more fuel efficient. To reduce the vehicles' weight, XFEs will use lightweight aluminum wheels, aluminum lower control arms, and an aluminum spare wheel. Aerodynamic enhancements include low-rolling-resistance tires, a soft tonneau cover, an extended front lower air dam, and lowered suspension. GM claims these alterations don't affect horsepower or towing capabilities.

"We are pulling out all the stops to deliver a more efficient package for customers who need the capability of full-size pickups and SUVs and want the very best fuel economy," said GM North America Vice President Gary White in a press release.

Production begins this fall. GM's XFE trucks and SUVs join the 2008 Chevrolet Cobalt XFE and 2008 Pontiac G5 XFE, on sale now.

A soft tonneau cover is one way GM reduces the aerodynamic drag and increases the fuel economy of the 2009 Chevrolet Silverado 1500 XFE.

08.14.2008