We have a 2008 6.4L,CC,LB, dually. It has 48K miles on it 90% plus of that pulling a heavy 06 3400 and now a heavy 13 3402 Big Sky.It has been all over the country and pulled some of the steepest grades. We have not had a single problem with it. It is a very strong truck. We can count on 10MPG at the end of a average day towing. I would say the average is 9 to 11 depending on the environment. This truck weighs in at 9K plus.. full fuel and ready to tow.Last weigh in at the fall rally was 9215lbs.. These are very heavy trucks. One usually finds only problems on Internet forums.
I won't recommend you purchase the truck as we have no idea about that particular truck but can offer our TRUE experience.
Remember the other two brands are much lighter contributing to better MPG and will still do the job.
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