Apparently, the new TDV8 comes about as close as you can get, Colinn. It's not just the "tang" in the throat though.It's the whole smelly slimy oily feel of diesel that I cannot handle. I was a Fleet engineer for many, many years, and the Transport manager after that, and since retirement, occasionally I drive lorries, so I've had my fill of it, thank you very much. With regard to economy,pounds per mile, my LPG'd V8 is slightly better than my daughtre's diesel.Still, there'll be petrol RRs on the s/h market for a while yet!