diesel fuel question

I will not burn bio unless it's an absolute emergency. I routinely drive about 60 miles round trip to a Mobil in Kenosha, WI that sells true #2 pre-mixed with Power Service. They move a ton of fuel so it's always fresh. Never had a problem. In NE Illinois, you can't find anything but bio, and I've seen nothing that tells me whether it's B5 or B20, other than a sticker that says may contain "up to 20%" bio. I ran some winterized bio in my old Ford this past winter and paid the price -- 2 sets of waxed up fuel filters and 3 new injectors. There will be no bio going in my new truck next winter, that's for sure.