LPG much cheaper than diesel...
But yes, reports of extra engine wear are a worry so think I'll sit on the sidelines for a while until there's some examples with 100K k on the clock...
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About 70c a litre if you use auto gas compared to 140c litre diesel. I'm hoping that only putting a small amount in will give a slight increase in power and slight increase in economy without putting too much extra strain on anything.
One that are related but not exactly what I was searching for:
Engine & fuel engineering - Propane enrichment for diesels
Here're the iron and alumin(i)um comments in this thread:
Engine & fuel engineering - Expert advise on diesel propane fumigation