I have posted every single tank for my HAH as well as for my boyfriend's Highlander Hybrid. I have noticed that several that have reached hypermiler status stopped so they would not lose their status.
If it were not for occassional trips to Austin or Houston, I think I would be at the bottom of the list. All my trips are short. I travel 1.7 miles to the light rail station, and 1.7 back home each day for work. When I bought my car I thought that I would average about 30 mpg which would be the low end of the estimated 29 - 37 mpg that I was led to believe by the EPA. I am actually averaging the same as what I was getting on my non hybrid accord. So I overpaid about $9000 over a similarly equiped accord, and did not get a sunroof or a spare tire but did get the constant display of mpg to remind me that my gas mileage is 22 mpg or less.
To add insult to injury, I tried to trade my car (with nav and less than 10,000 miles in absolutely mint condition) and was offered only $23,500.