"But it's just the first 60K of all hybrid models the maker sells" is not quite accurate either. They started counting the 60K starting from 1/1/06. None of the hybrids sold starting before that date were counted. The first Priuses was delivered in the US in August 2000. An earlier version which was sold in Japan before began shipping in December 97. Prior to 1/1/06, the Prius was eligible for a $2000 tax deduction (not credit). There was no cap or phaseout on that. I'm not sure what date that started.
Per http://www.fueleconomy.gov/feg/tax_hybrid.shtml (click Phase Out & Termination", the "phase out starts beginning of second calendar quarter after 60,0000 vehicle mark reached." So, the full credit is available to some vehicles past the 60K mark from a given automaker.
Would you consider buying a hybrid or alternative-fuel car?
-- Yes (Which one?)
-- No (Why not?)
-- Maybe someday (What's holding you back now?)
-- I already own a hybrid or alternative-fuel car (Which one, and what do you think of it?)

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