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Oh, the SUVs and 4WDs are definitely getting smaller, and cars are generally getting (slowly) more aero - but the phrase "kicking and screaming" comes to mind.
TBH, the CAFE limits earlier in this thread aren't too bad - if they were advanced about 10 years. You can bet that they'll get "re-negotiated" several times before that point though - like fusion power, decent fuel economy is always 10-20 years away.
Not sure how we'd get to 500 passenger-mpg with typical car occupancy though, that doesn't seem realistic (unless doing pre-charged hybrid number-fudging or similar)...
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