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HELL, NO,unless you're one of those California goofballs?
Let's see some pics of your truck
Very nice but you shaved your rear hatch or is it blurry?
E85 has it's place, but not for your Tahoe/Yukon. It contains 1/3 less energy than standard petrol. Where it has it's use, is if you have higher octane needs. Average e85 is rated ~95-96.