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Yes, that is why there are 2 different mpg listings for the same car... the lower one is for the Cali version, the other for the 49-state version.
I think one way to tell is to look at the emissions sticker inside the hood... if it states something to the effect of "meets California emissions standards" then it's a Cali version and won't have lean burn (unless of course someone modified it). For the '92s, I understand that even the Cali version can have a 5-wire O2 sensor, so that's not an obvious indicator for that year.
... I'll have to check to see what my emissions sticker says ...
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