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The trip readings are notoriously inaccurate The best method for working out your mpg is to brim the tank .
Tho saying that it should not be showing such a variance as yours is, 38 mpg is probably about right 30 is way to low, Your car is due a service that is why it is showing the change
Is there any performance/starting/running problems associated with the drop in your mpg ?
What mileage is showing on your Megane ?
For your year of Megane the service intervals are every 18,000 or 2 years which ever comes first.
Last edited by ottoman; 1st March 2008 at 07:25 AM.