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From the chev tracking thread, I've read that it's pointless to request updates more than once a week, as gm only updates their system info weekly (IIIRC, on Thursday?)...
Thats not always true if you are waiting to see if it updates to 2000 yes that would be Thursdays. But I have seen the codes change multiples in a day. 3800 to 4200 to 4300 then in the good days 4800 the next day.
 
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