Back in the day,,,, you could save receipts and file an application to the tax authority and get reimbursed for any road tax paid on dyed fuel. You can't do that anymore. Now when you purchase it you purchase without the tax being charged,,,, if done properly... If you purchase it with the tax charged, you just ate it.
What I mean by that is here in Missouri we have an organization called MFA. That's where I buy my fuel, road and offroad. They have small "cardtrol" stations scattered around Missouri. If I buy dyed fuel at one of them and use a normal credit card I am charged road tax. If I make the purchase using my MFA Petrol Card I am not charged road tax since the account is set up as a Farm Account. So in theory I can fill my Super Duty with dyed fuel using the Petrol Card and not pay road tax. There is a large warning sign on the pump telling you that is illegal. I have heard that if you get caught with dyed fuel in a road vehicle the government will estimate your annual mileage and charge you tax on all fuel used over the last year as if you dodged the tax, plus a hefty fine. Can't confirm that.
I don't have a bulk tank as Larry does so I buy all my dyed fuel at the MFA station and haul it in my truck tank or jugs depending on the situation.
As to dyed fuel being winterized. I run a governmental road grader. We have a 500 gallon storage tank that is bulk filled with dyed fuel. Whether the supplier claims it's winterized or not I could care less. A supplier's interpretation of winterized is good to 20 degrees F. So in the Fall when I get my last tank fill before winter I have it blended 50/50 with #1 and #2 fuel. If that's not possible I add an anti-gel additive. Which is what I do in my truck all Winter long. Never trust any supplier or fuel station that their fuel is winterized. That is unless you enjoy freeing a vehicle of gelled fuel. That's not a pretty situation. Had it happen 20 years ago in a grader when I believed the supplier had provided me Winterized fuel. At 0 degrees F, it turned into a 7/11 Slurpy. Not pretty at all.
So final thought,,, never,, never depend on anyone to provide you with Winterized fuel, take care of that yourself. Oh,, and clear fuel that you buy at the local gas station for your truck IS NOT Winterized to anything much below 20 degrees, use additives.