I loved my Avalanche but ended up with winning a lemon law on for a suspension problem. I loved the Avi because of the way it is set up, you know how much use that back is if you don't haul a lot of stuff. The Avi is like the coolest mini van on steroids ever made. I miss being able to take a nap on long trips like you can in the avi, that is the best thing about that setup. It depends on how use use it whether or not you should go with a truck. I have a 2010 Dodge ram Hemi and it is my favorite vehicle ever, it suits me right down to the bone. But my Avalanche was also one of my three favorite vehicles ever if it wasn't for the lemon law case.
I wouldn't buy another Chevy if you paid me they have 3 strikes- 3 vehicles- all new- all junk- all in the last decade- all 3 stinky air conditioners!!, don't have any problems with Ford owned many and still love Ford, but it is *** no mistake the Dodge is winning truck of the year so often. I live down a bumpy country road, and this truck is smooth over the bumps with the coil back suspension, and at 400 hp this baby hauls the mail when I need it or feel like it. Real world gas mileage is a tad over 16.*** I just tested it at about 75% free way and 25% city and that was the number for my hemi, just over 16mpg. I have no idea where you are getting your numbers, I thought the new rams are even better at MPG then the 2010, at least that is what the commercial says.
If I was that concerned with mpg, I would tell the dealer you want a 50 mile test drive and test the mpg yourself, even pay for the gas if you have too. If it comes near the sticker mpg, then go for it. If the dealer says no, to hell with them.
Bottom line is your interest rate is not bad for a truck, if you aren't have any issues and you don't haul stuff, stay in your Avi. But if you want to buy a new truck, there is none better then Dodge right now. I have zero regrets with my dodge and that is from someone who has regretted every other vehicle purchase since 1993 when I bought my other favorite vehicle a Bronco. In between the two I have had at least 10 dogs that I couldn't wait to get rid of. I am going to drive this Dodge into the ground, I hope at least 2 decades.