FYI, I also had the pleasure of meeting
ECOHondaOdyssey last weekend.
We went out for an ecodriving session in his van see if there was anything he could work on, technique-wise.
Not really! Pretty solid handle on what to do to squeeze ~11.7 L/100 km (if memory serves) from the beastly van in moderately busy urban traffic.
11.7 L/100 km = 20 mpg (US). The city rating for this van is 17 mpg (US), so that's 18% over EPA.
Also spent some time chatting about possible mods.