Toyota Prius: Factors in Prius MPG?

looking for links to info on breakdown of car design factors re how
they contribute to the differential in mileage rating re regular car,
e.g.:

compare the 'base' gasoline Camry mileage (~25 mpg?) to the Prius (~45
mpg?), assume the difference is ~20mpg, what factors account for this
~20mpg difference, and what is their relative contribution?

gas engine running at optimum rpm when on: 30%?
aerodynamic profile: 20%?
vehicle weight: 10%?
tire rolling resistance: 10%?
braking regeneration: 10%?
gas engine small displacement: 10%?
gas engine off when idle: 10%?
other factors???

would appreciate any links to websites that do an analysis of these
design factors, tia!

"NeoPhyte_Rep" <0.0.1> wrote in message
news:8y8Eg.2571$.. 

I'm not aware of any websites that analyze these factors in the Prius. Seems
like something like it should exist.....