Probably more water in the fuel in FL as the water tables and condensation factor is high. There also is in most instances a wind out of the South that drop all high profile vehicles on the way in unless you come in on a cold front that's headed South. I would also buy the diesel at a truck stop as the old fuel at some low volume sites probably gets degraded. Then the cold air tends to help in NC as it gets so hot in FL the air is wet coming into the intake and mixing with the Diesel. Moisture and rain plug many filters to the point of saturation cutting off air intake. When it's cold in FL engines seem to have more power.