This is not great data, but it's an anecdote at least. We had a 98 Old Silhouette with 3.4? liter v6. Not the dustbuster design, but the later one. On a one-day 600 mile vacation trip, fully loaded with family and krap, I got an honest hand calculated 30 MPG. Don't recall the wind conditions. I don't recall what the return leg was either. Normally it was a soccer mom car, and I have no recollection of what my wife got with it. But with me driving on that trip, I was pleasantly shocked at the MPG.
The Odyssey transmissions were a problem during a certain era, IIRC early 2000s.
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