Well I have trialled this at a mixture of 200 to 1 ratio with shell advance 2T probably over the last 18 months . Next to no difference in fuel economy but it starts easier in the colder winter months and idle rattle is reduced noticeably .One drawback for me is the exhaust odour is far stronger than without it , stopped using it in November for this reason but come winter I will be back on it for sure . Its a good thing me thinks .
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