If I recall my reading correctly the Prius2 completed much of the EPA City tests while on batts alone. If the pack was less charged at the end of the test than at the beginning it would make the mileage off by more than a normal car. The HCH is getting very close to the EPA rating, so much so that no major adjustment would be required. The Prius on the other hand misses by quite a bit. The EPA asked Honda and Toyota to change their published mileage and both refused. I think it is ok for Honda as they are not so far off but Toyota is causing themselves a PR problem with the inflated numbers.

Note: I'm not saying anything is wrong with the Prius, only with the accounting of the mileage. The Prius is a brilliant design and I'd love to have one. Been readin up on the geared CVT, amazing!

Did the P1 have the geared CVT?