Currently helping a mate to fix a HPFP on his Tiguan which he's running on Dino Diesel.
We had a jar of diesel and a jar of bio on the bench so I tried sticking a finger in each jar and rubbing finger and thumb together ... I know bio is said to have better lubricant properties than diesel, but the difference was quite remarkable.
If I had a car running a pump at 26,000 psi, I know which fuel I'd use!