My 2006 had about 33K miles and was in immaculate shape. It was the last year of the first generation. However, for some strange reason I thought it would be cool to own the last year of the second generation. I bought a 2013 last year, so I have been learning a lot about them. Mine came from a private seller about five hours from me...second owner. We went on NADA and used the price from that site with options, went to the bank together, and did the paperwork. Since that time, I have watched the prices go way down each month...I now owe more than the 2013 is worth. Thankfully, I only took a three-year loan.
I bought my 2006 brand new from the dealer and just sold it a couple of months ago after 14 years...because I had already bought the 2013 and couldn't keep two and had the loan on the 2013. Someone from the northeast called me up and really wanted my truck, and put a deposit on it just so I would not sell it to anyone else. He and his wife came down here and picked it up, and thankfully he takes very good care of it. After 14 years it was heartbreaking to watch it drive down the street with someone else at the wheel. I still miss that truck...especially the longer I drive the 2013.
Because 2013 was the last year they made the Av, people rushed to buy them, and because it was not a cheap truck, there were a lot of 72-month and 84-month loans. Doing them math, we are now in 2020, and those loans are up, so people are truck shopping again...especially with huge deals on the new Silverados. Therefore, the market is now flooded with them. In addition, everyone is now competing with the Internet, dealers selling online, and companies like Carvana, which are all driving values down.
The other things I have learned about the 2013 from owning one is that unlike the first generation Avs where we used to keep our trucks for long periods of time, people are not holding onto the second generation ones as long for three reasons:
1) The post GM-bankruptcy fit and finish is not as good as evidenced by the curling handles and cracked dashes
2) There are also safety issues related to dashes cracking because that is where the airbags are mounted
3) GM focused more on gas mileage than power/torque/towing in the second generation, moving away from the higher gear ratios and mostly to the 3.08s with increased active fuel management (AFM).
Normally, I am an optimist, but if I sound a bit discouraged, it is because I am...and if I had to do it all over again, I would have kept my rare 2006 and never bought the 2013. My advice is to sell yours quickly because the prices keep dropping. I recommend looking at NADA. Truecar.com also has fair pricing metrics you can see for others.
The things that really helped me sell my Av, in addition to the ultra rare bermuda blue color and the fact it was a southern vehicle that had never been driven in snow or ice, were the extremely low mileage and it was in awesome condition with no real blemishes. I definitely babied that thing. The painted-to-match Snugtop helped too...the new buyer really liked that.
Based on your description, the big thing you have going for you is your mileage, plus the fact that the silver ice metallic is a rare color for the 2013, so that may help too. If it is less than 500 bucks to get the blemishes painted, I would recommend going ahead and doing that if it is possible. For the smell, you can replace the cabin air filter and use some Ozium. It might also be worth getting a good professional detail. Have you had any problems with the dash cracking or door handles curling? What about underneath, is there any rust?
Tom
(please excuse any typos...it is late here and I am wiped out from work)