It varies, BD requires going out of my way to get it so I use diesel too. Around here we get B20 and B100 and I buy the 100% stuff. Since I didn't start with an empty tank, and do put Diesel in for convenience, I run between 10% and 95%.
"Quality Cable Work for Over .031 Millenium"
This is CABL.com posting #151155. Tiny Link: cabl.co/mNt9