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      04-21-2012, 09:40 AM   #57
IanS100
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Drives: 320d LCI M Sport Plus
Join Date: Nov 2011
Location: Southport UK

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A couple of years back I split 5 litres of Millers Sport 4 with a mate & because of the shelf life I double dosed on it for over a year - after I finished the bottle I stopped using it & saw no change in mpg and the car ran just the same