I did call down to the station and that was the only thing they would tell me and after a little more research, it is 99% bio, Im not to sure Ive heard it is bad for your truck and Ive heard that it is okay. I lost 2 mi a gallon on the bio.The truck im currently running is a stock 2002 shorty extended cab with 85000. SO im asking is this worth my while or stick to the regular diesel? Buy the way BIo was 4.47 a gallon when I fueled up in phoenix.