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Fire separation between drive thru and B use

Ok if outside heat detector

Either fixed temp or rate of rise or combo of both

Boy you are getting your money's worth out of one question
 
There is no seperation required between B and U occupancies in TABLE 508.4 REQUIRED SEPARATION OF OCCUPANCIES if that helps you in a mixed occupancy scenario.
 
My 2009 IBC requires 1 hour between a "U" & a "B" with sprinklers an 2 hours without sprinklers. Then again it is small enough to probably meet the non-separated portion of 508.3 if it is a U & a B.
 
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