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zero_spam

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  1. zero_spam
    My impression after 900+ miles is the fuel economy is not as good as my former 2015 LML Duramax. The 2015 was getting 18-19 on highway. The new one gets 16-17 on the highway. Same 100 mile stretch, same driver, same speed, only weeks apart. I hope it only needs more break-in. Anyone else experiencing this?
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