The cetane rating is lower in FL as they don't have winter blend nor do they care what the rating is as long as it burns. I never buy FL, WV or KY fuel if I can help it. If there were more water, the air would be denser, making you ahve more not less power. That's why a gasoline powered airplane is only good to about 18,000 ft without a turbocharger. Air is too thin and dry. Same with flying from FL to Flagstaff AZ. Low moist air, engines run better, prop grabs more air to dry high air. Look up density altiude.
NY fuel is 29 cents higher than other states so should have a higher cetane rating. It was 3.99 in Cortland yesterday and 3.70 in Fredericksburg Va.