I'm looking to get a 2007 Duramax crew cab 4x4 to tow our Tigé 24V and I have a few questions..... 1. What kind of gas mileage can I get towing and driveing around town? 2. What mod's can be done to improve HP and mileage? 3. What is the life span as far as total miles for the Duramax?
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