If an alternative fuel works our well and is massively available. Hopefully diesel car production could resume.

Alternative fuels supplied by a chain regionally some years back. Where a total disaster in our region. Resulting in the huge number of injection pump failures that occurred.

We were told the base of the product. Was fish oils. If a profitable workable substitute cannot be found for conventional diesel fuel available everywhere. New diesel car engines will not appear. I believe the 100 mile per gallon diesel car is possible today. If people will accept less power.

I never used that regional alternative fuel as it was not available in my local town. It still was a benefit to me though.

A gentleman traversing through our area had his 1984 300d quit on the highway in January. While burning new vegetable oil. The garage he had it flat bedded to had been changing out a lot of bad injection pumps. So they were reasonably biased.

Since the starter had burnt out trying to get it restarted on the highway. Their suggestion on what they thought it needed and the possible cost and delay. Drove him to buy a new car. To continue his trip. Actually I found it just to be the wire between the starter motor and solenoid when I got the starter off the car.

I got the car eventually although the garage owner had to apply to court to get a new ownership for me to transfer. Under two dollars in parts and a couple of hours total at most by me. It was running fine again. So one car I have was a road kill. His vegetable oil had just encouraged a growth in the fuel tanks vent line.

When and if new substitutes appear for conventional diesel fuel. I would probably observe how others have done with them for a year or more. before trying them myself.

Our break could come if they became mandated for use in heavy trucks. Otherwise I just cannot see the investment in refineries to produce low level production.

Also of note. Anything damaging to big oil or even showing the smallest potential to do so. Unless they control it and maintain the same or higher profit levels. I cannot see it being allowed to really evolve. The truck and rail diesel fuel is truly a massive business.