Welcome to the club. I had a '12 SV KC 4x4 prior to my '15 SV CC 4x4 and I didn't really use this forum for my '12. I really wish I had. I have found out what works and what doesn't very quickly on here via other peoples experience. It save a lot of time and money. If/when you want to do any mods, think about what you are wanting your truck to do, come here and search for solutions/advice and you will have a solid setup in no time. I never buy anything anymore before coming on here and seeing if it works first. As for mileage you just have to accept that it will suck if you want a full size truck, sounds like you already did that. Enjoy your new "T"