Do a factory reset on Sync. It will wipe everything and every setting the prior owner had. If you just want the channels I’m not sure if you can do that other than just reprogramming them to what you want. You can control how many rows of favorites you display.
Your mileage definitely sounds pretty low for the 1.5. It’s more in line with what I get with the 2.0 running Toyo OC AT3 245s. I’m about due for new tires and I’m thinking of moving to a set of Falken AT3 235s while I can still grab some and run those for the next 50k miles. I’m doing more road...
It’s ok. I like the look and feel of it, but they don’t have service history added in yet and I needed that this week so I switched back to get that info.