Litesong---Let it go. They're just used tires.
Update: Just filled up and mpg is up to 25 with the new tires. They feel much better than when freshly mounted. I never really noticed any tire break in on other vehicles, but this is very pronounced. My truck tires did improve a bit over the first few weeks, but I didn't really notice, maybe because I was always running around with several tons of firewood on it.
I drove around a farm today and it was wet, muddy clay. No traction problems, even on the hills.
