I hoped that everyone was calculating the numbers (isn't it called the Real Mileage Database?). The display in my 2000 Prius is always 6-14 % too optimistic. It is not only optimistic, but also varies a lot. Don't know how it works.

Johan Erlandsson

See mileage data for my 00 Prius.
See my environmental performance (still in swedish only, feel free to ask).