This is generally correct but when we speak of Arizona cars, it's usually understood that the reference is to southwest Arizona.My info is Florida cars tend to be all other things considered more desirable than cars from other states.
Lack of exposure to road salt and generally low miles.
AZ has a number of mountains and towns/cities in these mountains which of course during winter can get a lot of snow and thus get salt put on the roads.
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Yeah, sure a FL car could be driven north and thus be subjected to road salt but this has to be less common than an AZ car being from someplace that gets road salt.