Opinion Hypertech Mileage Program
11-10-2008 | 06:11 PM
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From: Waterford, MI
Opinion Hypertech Mileage Program
We have a 07 GMC 3500. I was wondering if anyone has installed one of these fuel saving devices. If so have you seen any decrease on diesel usage. Thanks Donna
11-13-2008 | 11:06 PM
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Might want to check the Duramax websites before you buy. Tons of great information on tuners and other upgrades.
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