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Got a 1.5dci 2001 clio, fuel economy over journey to work has fell from bout 65mpg to 55mpg!! this is even after changing oil and air and oil filters, drving style hasnt changed, any suggestions as to what might be causing this?
tick, i had my megane 1.9 dci in for its 36000 mile service and it went from doing roughly 47 when driving normally (quite heavy on acceleration) to about 23!!! it took almost 1000 miles to go back up to normal!! went back to the garage cuz i was convinced they had f***ed the car but they just said it was normal for diesels to do that...when u change the oil and filter it takes a while to get back to normal...personally i thought that was an absolute load of b****cks but it has sorted itself out eventually!