Yeah, inconvenient facts. The cars that Mercedes has with the OM654 and OM656 are pretty appealing, or would be if something like HPR was as available as dino and at a good price. But it isn't and all of us who are sober on these things knew it wouldn't be. Just not enough waste fat in the world to produce the volume. Dino is drawing on millions of years of accumulated sunlight energy, conveniently stored in liquid form. And I might be delusional with HPR, hyping it beyond reason.
And the B20 thing is whack. Gen 1 biodiesel should have been sold as a specialty item as it was at places like Biofuels Oasis in B-town. I used to fuel my 300SD there in the oh-ohs. Owners of older diesels, of course, have modified their hoses, etc. to deal with it.
Not sure how hard it is to reliably find B5. Discriminating between the two has not been an issue I've had to deal with. Search just now indicates that B5 is widely available. I could have sworn I've seen B20 labels most places I've gone. I am in a weird bubble re fuel. There are three Propel stations in my normal range. I use HPR 98% of the time.
But strange days for us IC guys. I don't really want an electric vehicle at this point. And meanwhile some wild developments are on the IC scene. The 654 and 656 are impressive from my vantage point. The Achates engine as well. That one at least will probably see use in big trucks. Reportedly meets the 2027 Cal emissions standards. And the Koenigsegg engine's pneumatic valve tech is pretty wild. Lot of potential there.
Could be the future for us diesel guys is with engines like the OM648 and a few others. I found this page about an adapter kit to mate the 648 or 613 to Chevy transmissions. Seems like that might be a cost effective route to go. OTOH, $1800 US, not cheap.
https://www.dieselpumpuk.com/shop/adaptor-kits/adaptor-kit-chevrolet-small-and-big-block-auto-trans-to-om613-om648/