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There doesn't appear to be anyone who can tell you DEFINITIVELY what will fit under the fenders of any of the literally hundreds of makes and models of cars produced over the years.
HOWEVER, my experience says you can usually get away with going up 2 sizes.
AND my experience says that it is more important the exact make and model of tire than the size. Rolling resistance varies quite a bit between makes and models of tires and can completely negate any benefits that might be achieved by changing rolling diameter.
Unfortunately, no one has published a comprehensive list of RR by make and model of tire - and the US government isn't supposed to get the process started until August of this year.
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