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I'm currently on the market for a 2015 Denali hd duramax, the only issue I'm having on my decision is what I need to do to get the best fuel economy. I get around 25-30 hwy. in my 02' lb7
 

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This thread is in the wrong section. move it to the LML section you'll get more replies

BTW you do not get 25-30 in your LB7
 
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