Boy I gotta tell you that after having this thing one week, there is no way I will go back to a gas truck. If I wasn't towing heavy. I would go with something like the new mid sized Chev diesel Colorado. This 6.6 Duramax gets better combined, city, and hwy mileage than my 4.7L Toyota Tundra. Both are 4x4 4dr trucks, and the GMC probably weighs 2,000lbs more. I can only imagine what mileage a V10 gets, 8-10 maybe?
Sorry, like I said I won't go back. To me it's like when we towed a 5th wheel the first time compared to years of bumper pulls. It's a 5ver for me from now on. My wifes' 2005 Honda Accord will be replaced with a diesel, if I get my way.