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I just picked up a new (to me) truck. Its a 2001 Chevy Silverado 1500HD with the 6.0 liter engine. Has anyone had any luck with improving the fuel economy with this size engine? I'm currently getting about 12.2 mpg's on the highway and I wouldn't mind making a few slight mods to the truck if I could bump it up into the 14-15mpg range. Thanks!!
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