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Old 09-23-2020, 04:52 PM   #31 (permalink)
EcoModding Lurker
Join Date: Aug 2015
Location: chandler, AZ
Posts: 12

Work pig - '07 Chevy 2500hd classic Wt
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Old thread i know, but any updates? I own a 2007 2500hd classic cclb 4x4 and having hard time breaking 11mpg. Currently have headers, exhaust, volant intake, black bear tune, and e fans. I honestly haven't seen even 1 mpg increase with any of this.

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