I recently had to pick up some friends from Ohare airport in Chicago. I'm just north of Milwaukee, and I took their 2014 Honda Odyssey which is identical to the picture above. I had filled it up before heading out, so I reset the tank average. As I set out, I was very surprised as the average...
JUST
KEPT
INCREASING
It finally peaked at 37.1 before I got stuck in traffic right around the airport.
Upon bragging to Darin, he mentioned what I had suspected. That version of the Odyssey does in fact have cylinder deactivation. In the pictures, you can see the ECO light. Whenever that was on, the mileage took a good jump up. The great thing was that I basically just set the cruise control at the speed limit and it did the rest. The cruise did a great job of keeping it in eco mode. It would allow the speed to drift a bit more than most cruise controls I've seen.
I'm impressed. Kudos to Honda!