General MPG drop!!!

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General MPG drop!!!

AY786

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Joined
Apr 4, 2008
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242
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Location
West Yorkshire
Basically, my car has been off road for a month and in that time the battery has died completley (needed changing anyways), ive put a new battery in and ive been getting readings of 28mpg compared to at least 40mpg before. Have i not resetted my ecu properly you think or is it one of those where if i drive on the motorway long enough, it will sort it self out?
 
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