Could you make your own magnetic plug by epoxying a magnet to the end of the oem plug?
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View my fuel log 2014 Mirage ES 1.2 automatic: 36.9 mpg (US) ... 15.7 km/L ... 6.4 L/100 km ... 44.3 mpg (Imp)
Has anybody seen or have ever used the FilterMag?
http://www.shopfiltermag.com/how-it-works/