Fuel is cheaper, taxes are lower (when I left CA car registration was over $400/year I recall, mine is $50 here) and housing is much cheaper.
Not sure if this link will still work for you:
http://bestplaces.net/col/?salary=80000&city1=54865000&#...
According to their stats I would need 2.3x the salary I make here for a comparable lifestyle in SF. Now, I'll grant you that could be mitigated by not living in SF but one of the cheaper suburbs. Mess with the numbers and see what it looks like.
Equivlalent lifestyle is always fuzzy: do I need a car if I live in SF? Maybe but many do well without. If you are into urban living...you wouldn't be very happy in San Antonio. In NYC, this is magnified obviously. You can also move out of SF, and unfortunately, many jobs are in the bay area and not the city anyways (so live in Mountain View vs. SF and work at Google).
For the record, I still think SF is too expensive and would prefer Seattle or Portland for quality of life reasons (but I'm a native PNW). I wouldn't dream of moving to Texas, I didn't even find Austin to be very nice; I don't like driving and haven't owned a car in over 7 years (when I lived in the Bay Area ironically).
Also, the parent post compared SF to other thriving cities in the US, not the US in general. Would love to see how SF is twice as expensive as some place like Atlanta or Dallas (assuming they are thriving, of course).