The General already offers hybrid versions of its full-size SUVs, which are also joined by hybrid versions of its half-ton trucks for 2009, but the XFE models will continue to be powered by a flex-fuel version of the company's 5.3L gasser V8. It produces 320 hp/340lb-ft in the Tahoe and Yukon, and 315 hp/338 lb-ft in the Tahoe and Yukon. All are rear-wheel-drive only and mated to GM's 6L80 six-speed auto with a fuel-saving 3.08 ratio rear axle. In order to maximize fuel economy, all four of these new XFE models get low rolling resistance tires, aluminum wheels, an aluminum spare wheel, aluminum lower control arms and a lowered suspension with revised tuning. In addition, the Silverado and Sierra also get a new front lower air dam and soft tonneau cover that improve their aerodynamics.
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from what I heard they are lower the stock tahoes not much like a one inch on all 4 corners...wondering if the 2/4 kit is going to rub or not but I can make it a 2/3 drop without the rear spacers
