Until I went past the 100,000 mile warranty, the fact that my owner's manual said not to use over B5 was my primary reason for avoiding higher percentages of Biodiesel. Now I try not to fill up completely with a higher percentage counting on dilution from what is remaining in the tank.
I am under the impression that all Flying J/Pilot now sell only 10-20 percent Bio Fuels. So, I avoid them even though I still have a loyalty card. Illinois is nearly impossible to find a station with less than 10% biodiesel so I fill up before and try to make it through without needing to purchase fuel. Missouri is not quite as bad as Illinois, but the last couple of years it has been harder and harder to find B5 or less.
