Tiny percentages of bio we are talking about (2% or less) should not pose a problem due to hygroscopic issues. QC on bio coming from the refinery and/or distribution centers in pump fuels should also not be an issue. While HPR may be cleaner and help the equipment do its job, I am not convinced the emissions coming out of the tail pipe are substantially cleaner. But I have no issues if you want to use it, I just don't think it does all that much better than regular D2 in our cars. Just my opinion. Besides it isn't really available anywhere other than California and one location in Washington IIRC.Biodiesel is also hygroscopic and has a different viscosity than D2. This is the biggest issue IMO and creates significant risk in using it with a HPCR system as they are extremely sensitive to both water and viscosity. Besides the inconsistent QC.
HPR is great for post 2008 emissions controlled diesels. Less soot means longer time between DPF regenerations and less EGR valve and intake fouling. You will also notice it takes longer for your oil to turn black after an oil change. As with all high cetane fuels, there is an unfortunate slight loss of power, felt as reduced low end torque and the resulting fuel economy loss.
I don’t use HPR in my ALH but it works great in my 2.8 Duramax and CBEA.