Originally, when the GMC Yukon Hybrid and the Chevrolet Tahoe Hybrid made their debut, GM said they expect a 25 percent improvement in fuel-economy than their standard versions. GM then said that it expects the hybrid SUVs to get 40 percent better fuel-economy giving them both 19 or 20 miles to the gallon.
Well now, GM is saying that the 2008 Chevrolet Tahoe and GMC Yukon Hybrid SUVs will deliver fuel economy gains of 50 percent over their non-hybrid models...
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