Grocery bills are highly subjective and they depend on how much you eat, and whether planning, cooking, eating and cleaning up after 3 meals are the main priority of the day.
Also, there are other mitigating factors that are more favorable here.
From this
Map of State Income Tax, it looks like Minnesota runs neck and neck with Oregon for the No. 2 ranking in the nation, second only to California.
Top State Income Tax Rates in 2014 | Tax Foundation
This map showing
The Real Value of $100 for Each State shows MN and FL as having equal buying power:
The Real Value of $100 in Each State | Tax Foundation
On this map of
Median Property Taxes Paid by County Nationwide, the northern 2/3 of Florida is lower, and our particular area looks among the lowest.
Median Property Taxes Paid by County, 2005-09 | Tax Foundation