The BAS hybrid Trucks only give a small hybrid assist as Justin points out. Its a mild-hybrid system, not a full two-mode system like was launched for the Tahoe, Yukon and Escalade as well as Silvy/Sierra. THAT will give you a much higher MPG rating, and if you do highway, you could see some serious gains.
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2/20/2013: They Day the ****s Stopped
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