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This happens in other ways to, like how does my fiancee's kia get 25mpg (epa) on a 1.5 L engine with like 400 less pounds than my car and I get 25mpg (epa) on a bigger engine and heavier car?
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Apples and oranges. Each engine, drivetrain, body is different in so many respects that you can't really pin it down to one thing usually.
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And that also makes me think "if the crx got 50mpg, and the prius has a 1/2 electric engine, how come they get about the same mpg, how come toyota couldn't have make the prius get 100 mpg easy?
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In this case there are a couple of biggies:
1) The Prius is a
lot heavier. CRX ~1900 lbs Prius ~ 2900 lbs. 1000 lbs more.
2) The CRX uses lean burn but the Prius does not. This is because of emissions, I believe. Lean burn produces a lot of nox which, to get SULV status, the Prius can't have.
There are other reasons but those are the biggies.
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I know with all the electronic crap and "modern conveniences" in new cars weigh it down but why cop out? just make another "FE" prius that DOES get 80/85MPG epa....
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Like the RS Porsches, all stripped down, only for FE in this case. Seconded!
Having said all that, the Prius is capable of
much better FE than EPA as demonstrated by some hypermilers without a PHEV kit. There are even some Japanese hypermilers that regularly get 100+ mpg
driving slow using P+G.