I remember a tranny shudder problem that was cured by a firmware update to the Edge, but not the fuel economy going the wrong way. I can't think of a suitable search string other than "tranny shudder" (which people often misspelled "tranny shutter"), and that's giving me more hits than I care to wade through.
But you're right, if this is related, I'm sure Bill will know how to fix it.
- Jack
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