I know of several Tahoes of this vintage that have had the front wheel bearing go out.
I bought an '08 Tahoe last year. 5.3l V-8. According to the computer stuff on the dash I get about 20mpg on the highway at 70-75mph. Overall I like the vehicle. It had 21000 when I bought it, 48000 now, no problems so far.
I pulled a 21 ft camper to New Mexico last June, averaged 9.4mpg on that trip. The book rates the 5.3 to pull up to 7100 lbs, but based on performance with my camper I think that's overrated. I was probably towing 4000lbs between camper and gear.
It's very comfortable and quiet on the highway, and has a very tight turning circle for parking lots.
Wait til you fill it up with gas! Have fun with that.
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