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I could be interested in LPG - for people like me that dislike the characteristics of diesel engines, want something fairly quick, but do plenty of miles (30k+) it could make sense.
I, too, would worry about an LPG conversion on something as complex as the N53 or N54 engines. I have often considered a slightly older AMG V8 Merc with LPG but the other running costs besides fuel are likely to be horrific.
However, I get 34mpg average out of mine anyway (34.4 over the last 3 months), a Merc V8 on LPG in the low 20's would be too similar a cost per mile to make it worth the potential extra hassle.
I'll keep my eye on LPG but I think I would only buy a car that was already converted and had a history of running perfectly.
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