hey: I wish in my case it was that easy. Here in redneck oklahoma we don't even have B20 at the pump. I use the EP Moly treatment every other oil change... at 275K miles compression tests show excellent compression in all cyl. Turbo still making good boost.
Is this all due to the EP? Who knows... but it does show me, its not hurting anything.
I also use the fuel additive that Bama posted above... Our local truck stop started stocking it 4 months ago... But Since I bought the truck... I have been adding SoyPower @ every fill up... It not the same as B20 but it's as close as I can get for now.
Maybe someday.. Oklahoma will catch up and start having B20 trucked in.