While many aspects of the 6.6-liter Duramax diesel are highly praised, many owners have experienced trouble with the fuel pump and EGR system. These issues have occurred across the GMC Sierra ...
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How Many MPG Does A 6.6 Duramax Get? Here's What Drivers Are Sayingscouring the internet for 6.6 Duramax fuel consumption figures in real-world driving conditions. Read more: A Quick Guide To GM's Ecotec3 5.3L V8 Engine: What You Need To Know In one Reddit ...
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