Daox, have you asked the owners if the readout is accurate? I own a 2005 Odyssey that I have a hard time getting to mid-20s. That is a much newer van but still. I guess that number is the peak, not average which is not "fair" to compare.
Regarding cylinder deactivation, I... deactivated mine. I didn't like how it transitioned and apparently it's not very good for the car.... The system contributes to premature failure of expensive, electronic engine mounts and causes carbon buildup. I believe Honda actually lost a case on this (different model). Deactivating the ECO mode is a popular mod on my gen Odyssey.
In my humble opinion, some "eco" mods are just not "worth" it.
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