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2006 Chevrolet duramax 4×4 Fuel mileage?

I have a 06' Chevy Duramax 4×4 and I hear from a lor of people that they are getting about 18 miles per gallon!
Then I ask what they get when towing a RV! anf they say they are getting about 14 mpg! I am only getting about 11 1/2 mpg, when towing my fifth wheel, which weighs about 9000 lbs. Could there be something wrong with my truck? I have a bully dog programmer in my truck that I run at about 95 extra horse power. and it seems to work well with just regular driving, I also have a K&N air filter I installed, that is suppose to help a little. Like I said I wonder if something is wrong with my trucks towing or if it is just kindive normal? I also just to give as much info as possible am running 245 size tires which are factory standards. any help would be appreciated thanks

I have an 06 with BD and the allison., it gets 12 pullin trailer and truck,+ 4000lbs in pullin weights. Lots of power but crappy milage..lol its the way it goes.

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