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Hi
my system was from manifold to tail with a new free flow cat. when i use to drive 500 miles to scotland i had to fill up before glasgow after system was fitted could drive to stirling before filling. did this trip 3 times a year for 4 years. i have always kept mpg figures for all my cars apart from v6 shogun which i did not want to know how bad mpg was. certainly no where near book figures. might be as low as single digits but needed a 4wd for driving over scottish mountains to get to work. many a time a white blizzard made driving interesting and 6"+ of snow on road.
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