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Custom screen would be the best. I'd love to see instant MPG somewhere. Also some of you ODBII info would be nice...incoming air temp, engine temp. Would be awesome if GM would make this and the radio user configurable. You can get nav directions on both, so there is a comm channel. I'd love to put vehicle diagnostics on the radio display when I wanted to. They could send us all a usb drive w/ an update we could install!! you know, while I'm dreaming.........
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