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For more Avalanche specific questions, you can look here
http://www.chevyavalanchefanclub.com/cafcna/index.php
check the performance area

you only have to license your vehicle once, you can tune the same vehicle over and over.

Onstar doesn't track that info in real time, they just pull it once a month right before they email it to you.
I get the reports by email, but nothing out of the ordinary.

Here's a write up that was done in an Avalanche, might help you.
http://www.chevyavalanchefanclub.com/cafcna/index.php/topic,90504.0.html

I believe he could, if there were one there to compare to.

Just looking around, making small changes on my '07, taking baby steps.
Thinking about future after I get a few miles on my truck, and maybe going with a Vortech or something along those lines.

Go to chevyavalanchefanclub.com
look up flabouy or ky_bob, one of them should be able to help you out.

engine/fuel control/cot, lean cruise