I would love to use bio on a regular basis, but there's just too much baggage associated with it. Too much risk of contamination issues/plugged filters, etc.

Bio fuels like ethanol fuels are the ones that I avoid these days and I'm not one to fuel at Wal mart regardless what the fuel is.

I break down and go to Wal mart once or twice a year for odds and ends that nobody else carries. Primarily Neutrogena lotions these days.