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On my 20 I have speed limits in the HUD. I also have OnStar. however to the best of my knowledge the speed limits come from the Nav Data on the card not OnStar. I've also updated the Nav earlier this year to the newest release at the time so have the latest data that is available.
Though even with the latest data, there are still times where I've not had the speed limit or the speed limit is there but has been wrong. This has happened on some country roads and also suburban roads neither out of cellular range, and with good satellite signal. So again makes me believe that the data on the sdcard is simply missing and/or incorrect for those roads. And I could believe that depending on where you live and drive could really contribute to whether that data will be there or accurate.
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