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thanks for your answer but I have been measuring my mileage over the last 9000 miles and therefore many tanks.
I fill up at the same Shell gas station and at the same pump and positioned the the spout the same way in the neck and stop tanking when the automatic stop stops the fluid each time I tank which is about after 350 miles.
I.e. although primitive it still will give me a mileage figure within plus or minus a couple of tenths difference but never 25%.
Hence are either the O-2, OBC, or AMS the culprit???
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EJO now a 1993 944T 207K; ex '65 123S; ex '75 245; and ex '81 242GT; also 2001 Kia Sportage, Chrysler 2002 T&C and 2006 MINI Cooper
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