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Bob, thanks for a good, honest report. I suspect the reason you saw the change in behavior for the better after towing for awhile is the GM may do as the Ford does. That is, it constantly analyzes all the info the computer receives over the last xxx miles and is smart enough to figure out that it needs to adjust the operating parameters. I see the same thing when towing after a month of non-towing. After about 50 miles of towing the behavior seems to adapt to the new environment, shift patterns change, etc.
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