I have only had my Tahoe for about a month. I've towed with it, used it for work and just driving with my family. I'm 25 yrs old and even the way I drive the truck still rides great, handles perfect, and I'm getting over 19mpg. Since the truck was used and had 168k miles on it when I bought it, it was really taken care of. The interior is luxury especially for a workable SUV.
Sound system, storage, and power
The only improvement I could see is stiffer rear suspension
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