New guy here, my name is Jeremy. I am currently in the Army but am preparing for life after the Military since I am going through the medical board process. I am thinking about getting a Duramax (unsure if it will be a 1 ton dually or a 4500 Kodiak) with the intention of hauling vehicles and other cargo. I haven't been able to find much in the way of hard facts with regards to CNG and towing economy. I know the extra power would be great but I wouldn't really be interested in paying $5,000-$10,000 for a CNG setup unless it provides much better fuel economy. I read about the Natruell equipped Durmax getting 35-45 mpg but I haven't seen what that figure would drop to with 14,000 lbs behind the truck. I guess what I am asking here is what is the best option for the Duramax with CNG? I assume that a CNG system would automatically void any warranty, any info on this? Thanks for any info or links.