This discussion reminds me of some churches..."Mine is the best..No Mine is !"
Can't we just agree to disagree on somethings and all agree that no matter which car you go with your doing the environment a huge favor ?
While I would agree the GH milage database is great due to the number of data points, you may also want to check out the EPA's "Real-World" milage database of drivers posting data.
https://www.fueleconomy.gov/mpg/MPG....ion=browseList
The results show both the '06 Prius and '06 HCH are nearly identical, 44.4 (HCH2) vs 44.1(P2). I find this amazing, based on the significant diffrences between IMA and HSD