The only thing I can say about the gas mileage... it is what it is. When you buy a full sized truck like the Titan you are acknowledging that gas mileage is not the driving factor in your life. For example, I have a small Toyota Echo that I use for my daily commute into Pittsburgh. I really don't want to put 100 miles a day on my Titan. However, for any non commuting drive I will be in my Titan. As for the towing capactiy they are in line with all the other full size trucks. I have carried over a 1/2 ton of river rock, in my bed on multiple occassions, and the truck has been flawless.