Thanks classic, so CR being below what LPG likes means, power does take a hit over what it would ideally be, but it's not the major factor. What is, is the lower density which compared to petrol this either depriving hte engine of fuel or air relative to petrol.
I had not realised CNG was so different to LPG in it's requirements. Thanks.
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Bifuel V70 Classic 1999 [The Old Grumpy in the Corner, "When I was a lad... blah, bl**dy blah."]
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