Yunick's engine was in an 024 Omni if I remember right.On the pinto with the vapor carb,we disconnected the vacuum advance.I believe they usually do the same thing on propane conversions.And yes,the propane is heated with engine coolant to help keep it a vapor.Heat,fuel.Hmmm.Kind of sounds a little like SVO use,doesn't it.Can't wait untill I can try my 220D on WVO.

As far as Pintos being death traps because of their gas tanks.No more so then about half the other cars built in the 70's and 80's.Yes the first Pintos had wimpy bumpers.But so did alot of full size cars of the time.And about half of the cars had their fuel tanks under the trunk,just likethe pinto.I don't know why Nader hated them so much.Half the cars out there were just as much of an explosion risk.Oh well.

Fuel cells.
They have amazing potential,but their not efficient enough yet to be cost effective.I think the most efficient way to use them now,would be in converting methane to electricity.Alot of land fills across the country are recovering the methane and using it as fuel for piston engines to generate electricity.Think of the potential energy gains if private & city sewers collected methane for fuel cell or engine use.Right now,the electrolosis used for water conversion isn't nearly efficient enough.But like I said,maybe with the right metals,and some kind of grid design.It could be made efficient.Different alloys and better plate designs have greatly increased batteries over the years.

To keep it in the proper spirit of this Mercedes forum.
I would suggest some of the methane being burned in some nice dependable MB engines to generate electricity.LOL,but not a bad idea.