I heard/read somewhere that "name brand" stations only have to buy one tanker out of so many to keep the name. The rest of the fuel can come from anywhere and probably isn't BETTER quality.
I've never had any probs that I can attribute to B2, B10, B20, or even B40. Until I do I'll continue to use it.
Stations areound here are the same way with pricing. Right now B20 should add only $. 05 at the most. Anyone chargin that for B2 is trying to run bio out of the marketplace. There's way too big of a tax break for bio to cost that much. Blenders are/were getting $1. 00/gal rebate for bio. Not sure if that's still in effect though. That's what made bio competitive. The good blenders/resellers will pass at least most of that along. I know my fuel guy does, probably 'cause I know about it.