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I got a 2011 Silverado 2500HD Duramax Im usually droving 2000milles a week pulling 13000 pounts each way getting about 11 to 11.5 MPG I was wondering if I can improve my MPG?
 

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thats not bad milage pulling that weight, and yes you can increase in sum but you will void warranty if you have it, programmer and exhaust will help
 

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I don't know how fast you're traveling, but the difference between 60 and 70 MPH is pretty big. Slow down a little, and MPG's will improve. I usually click the cruise at 63 MPH, about 1500 RPM is 6th gear.
 

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Speed, programmer, exhaust, speed, speed.

Did I mention that speed is probably the biggest impact for fuel mileage?
 
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