Idiolect or more widespread?

[Laurence Horn]

>>Subject:      Idiolect or more widespread?
>>"not
>>based off a book, not based off another movie, and not based off a TV show".
>>"Based off" seemed to me to be a peculiar alteration of "based on".
>
>"based off a book" as well as "based off of a book" is fine in my Texas
>idiolect.  Raw Google data prefers "based off of a" to "based off a"
>almost 3:1.
>
Anymore, when "based on" is often more like "ripped off", who's to
quibble with the choice of preposition?

LH

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